Statistics Quiz


 

Question 1 of 20
1.0 Points

The create of the opinion fancy can be:

 

A.one-tailed

B.two-tailed

C.neither one nor two-tailed

D.one or two-tailed


Question 2 of 20
1.0 Points

A lab technician is experimented for her amalgamation by administering multiple measurements of cholesterol smooths from the identical dignity scantling. The target exactness is a discord in measurements of 1.2 or short. If the lab technician takes 16 measurements and the discord of the measurements in the scantling is 2.2, does this prepare plenty illustration to exclude the straight that the lab technician’s exactness is among the target exactness?
Compute the appreciate of the misspend experiment statistic.

 

A. = 30.58

B.= 27.50

C.t = 27.50

D.z = 1.65


Question 3 of 20
1.0 Points

A two-tailed experiment is one where:

 

A.results in either of two bearings can administer to excludeion of the trifling fancy

B.no results administer to the excludeion of the trifling fancy

C.results in barely one bearing can administer to excludeion of the trifling fancy

D.disclaiming scantling instrument administer to excludeion of the trifling fancy


Question 4 of 20
1.0 Points

A trifling fancy can barely be excludeed at the 5% middleing smooth if and barely if:

 

A.the trifling hypotheses embraces sampling deception

B.the trifling fancy is biased

C.a 95% admission season does not embrace the hypothesized appreciate of the parameter

D.a 95% admission season embraces the hypothesized appreciate of the parameter


Question 5 of 20
1.0 Points

A censorious fume has an middle peak prosper tallness of 16.4 feet for prospers hitting the bench. Suppose that a fume is in proficiency delay a censorious fume adjust rating. Let us say that we absence to set up a statistical experiment to see if the prosper renewal (i.e., tallness) is passing down or getting worse. If you absenceed to experiment the fancy that the prospers are passing down, what would you use for the hesitate fancy? Is the P-appreciate area on the left, straight, or on twain sides of the middle?

 

A.H1:  is elder than 16.4 feet; the P-appreciate area is on twain sides of the middle

B.H1:  is short than 16.4 feet; the P-appreciate area is on the left of the middle

C.H1:  is not resembling to 16.4 feet; the P-appreciate area is on the straight of the middle

D.H1:  is elder than 16.4 feet; the P-appreciate area is on the left of the middle


Question 6 of 20
1.0 Points

In an designation indubitable in Today’s Health a writer states that the middle sum of calories in a serving of popcorn is 75. To state if the middle sum of calories in a serving of popcorn is contrariant from 75, a nutritionist clarified a stray scantling of 20 servings of popcorn and estimated the scantling middle sum of calories per serving to be 78 delay a scantling measure derangement of 7.

At the a = .05 smooth of middleing, does the nutritionist keep plenty illustration to exclude the writer’s straight?

 

A.No

B.Yes

C.Cannot Determine


Question 7 of 20
1.0 Points

Results from antecedent studies showed 79% of all proud nurture seniors from a established city intention to notice propaganda succeeding ordination. A stray scantling of 200 proud nurture seniors from this city reveals that 162 intention to notice propaganda. Does this denote that the percentage has increased from that of antecedent studies? Experiment at the 5% smooth of middleing.
Compute the z or t appreciate of the scantling experiment statistic. 

 

A.z = 1.96

B.z = 0.62

C.t = 1.645

D.z = 0.69


Question 8 of 20
1.0 Points

Results from antecedent studies showed 79% of all proud nurture seniors from a established city intention to notice propaganda succeeding ordination. A stray scantling of 200 proud nurture seniors from this city reveals that 162 intention to notice propaganda. Does this denote that the percentage has increased from that of antecedent studies? Experiment at the 5% smooth of middleing.
State the trifling and opinion hypotheses.

 

A.H0: p ≤ .79, H1: p > .79

B.H0: p = .79, H1: p ≠ .79

C.
H0:    = .79, H1:  > .79

D.H0: m = .79, H1: m > .79


Question 9 of 20
1.0 Points

In an designation indubitable in Today’s Health a writer states that the middle sum of calories in a serving of popcorn is 75. To state if the middle sum of calories in a serving of popcorn is contrariant from 75, a nutritionist clarified a stray scantling of 20 servings of popcorn and estimated the scantling middle sum of calories per serving to be 78 delay a scantling measure derangement of 7.
State the trifling and opinion hypotheses.
 

 

A.H0:   75, H1:  > 75

B.H0:   75, H1:  < 75

C.H0: = 75, H1:  > 75

D.H0:  = 75, H1:  ≠ 75


Question 10 of 20
1.0 Points

A lab technician is experimented for her amalgamation by administering multiple measurements of cholesterol smooths from the identical dignity scantling. The target exactness is a discord in measurements of 1.2 or short. If the lab technician takes 16 measurements and the discord of the measurements in the scantling is 2.2, does this prepare plenty illustration to exclude the straight that the lab technician’s exactness is among the target exactness?
State the trifling and opinion hypotheses.

 

A.H0: s2 ≤ 1.2, H1: s2 > 1.2

B.H0: s2 ≥ 1.2, H1: s2 ≠ 1.2

C.H0: s2 < 1.2, H1: s2 ≠ 1.2

D.H0: s2 ≠ 1.2, H1: s2 = 1.2


Question 11 of 20
1.0 Points

The fancy that an analyst is hard to conresolute is determined the:

 

A.smooth of middleing

B.elective fancy

C.opinion fancy

D.property of the elaborationer


Part 2 of 3 -

 

Question 12 of 20
1.0 Points

 

Accepted characters: sums, decimal object markers (conclusion or comma), memorial indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in philosophical notation). NOTE: For philosophical notation, a conclusion MUST be used as the decimal object marker.
Complex sums should be in the create (a + bi) where "a" and "b" insufficiency to keep lucidly normal appreciates.
For pattern: {1+1i} is strong when-in-fact {1+i} is not. {0+9i} is strong when-in-fact {9i} is not.
A statistician effortes to experiment the straight that the measure derangement of the weights of firemen is elder than 25 pounds. To do so, she clarified a stray scantling of 30 firemen and build s = 27.2 pounds.
Assuming that the weights of firemen are normally exclusive, if the statistician absenceed to experiment her elaboration fancy at the .05 smooth of middleing, what is the crucial appreciate?
Place your counterpart, rounded to 3 decimal places, in the unmitigated. For pattern, 23.456 would be a real note.

Question 13 of 20
1.0 Points

 

Accepted characters: sums, decimal object markers (conclusion or comma), memorial indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in philosophical notation). NOTE: For philosophical notation, a conclusion MUST be used as the decimal object marker.
Complex sums should be in the create (a + bi) where "a" and "b" insufficiency to keep lucidly normal appreciates.
For pattern: {1+1i} is strong when-in-fact {1+i} is not. {0+9i} is strong when-in-fact {9i} is not.
Suppose a resolute that produces gentle bulbs absences to comprehend whether it can say that its gentle bulbs typically last over than 1500 hours. Hoping to discover food for their straight, the resolute learns a stray scantling of n = 25 gentle bulbs and history the era (in hours) of each bulb. The advice akin to the fancy experiment is presented beneath.
Test of H0:  1500 versus H1:  > 1500
Sample middle 1509.5
Std deception of middle 4.854
Assuming the vitality protraction of this model of gentlebulb is normally exclusive, what is the p-appreciate associated delay this experiment? Place your counterpart, rounded to 3 decimal places in the unmitigated. For pattern, .123 would be a real note.

Question 14 of 20
1.0 Points

 

Accepted characters: sums, decimal object markers (conclusion or comma), memorial indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in philosophical notation). NOTE: For philosophical notation, a conclusion MUST be used as the decimal object marker.
Complex sums should be in the create (a + bi) where "a" and "b" insufficiency to keep lucidly normal appreciates.
For pattern: {1+1i} is strong when-in-fact {1+i} is not. {0+9i} is strong when-in-fact {9i} is not.
The CEO of a software assembly is committed to expanding the relation of proudly adapted women in the organization’s staff of salespersons. He believes that the relation of women in concordant sales positions resisting the empire is short than 45%. Hoping to discover food for his admission, he directs you to experiment
H0: p .45 vs H1: p < .45.
In doing so, you learn a stray scantling of 50 salespersons filled by his assembly, which is reasoning to be symbolical of sales staffs of competing organizations in the diligence. The learned stray scantling of magnitude 50 showed that barely 18 were women.
 
Compute the experiment appreciate that you would use in influenceing this experiment. Place your counterpart, rounded to 3 decimal places, in the unmitigated.  For pattern, -2.345 would be a real note. 

Question 15 of 20
1.0 Points

 

Accepted characters: sums, decimal object markers (conclusion or comma), memorial indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in philosophical notation). NOTE: For philosophical notation, a conclusion MUST be used as the decimal object marker.
Complex sums should be in the create (a + bi) where "a" and "b" insufficiency to keep lucidly normal appreciates.
For pattern: {1+1i} is strong when-in-fact {1+i} is not. {0+9i} is strong when-in-fact {9i} is not.
A medical schoolman effortes to experiment the straight that the measure derangement of the systolic dignity urgency of sagacious sea multifarious is elder than 450. To do so, she clarified a stray scantling of 25 multifarious and build s = 468.
Assuming that the systolic dignity urgencys of sagacious sea multifarious are normally exclusive, the schoolman would percreate a chi-square experiment to experiment her elaboration fancy. In that predicament, what is the experiment appreciate that she would estimate.
Place your counterpart, rounded to 3 decimal places, in the unmitigated. For pattern, 34.567 would be a real note.

Question 16 of 20
1.0 Points

 

Accepted characters: sums, decimal object markers (conclusion or comma), memorial indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in philosophical notation). NOTE: For philosophical notation, a conclusion MUST be used as the decimal object marker.
Complex sums should be in the create (a + bi) where "a" and "b" insufficiency to keep lucidly normal appreciates.
For pattern: {1+1i} is strong when-in-fact {1+i} is not. {0+9i} is strong when-in-fact {9i} is not.
Suppose a resolute that produces gentle bulbs absences to comprehend whether it can say that its gentle bulbs typically last over than 1500 hours. Hoping to discover food for their straight, the resolute learns a stray scantling of n = 25 gentle bulbs and history the era (in hours) of each bulb. The advice akin to the fancy experiment is presented beneath.
Test of H0:  1500 versus H1: > 1500
Sample middle 1509.5
Std deception of middle 4.854
Assuming the vitality protraction of this model of gentlebulb is normally exclusive, if you effort to influence this experiment using a .05 smooth of middleing, what is the crucial appreciate that you should use? Place your counterpart, rounded to 3 decimal places in the unmitigated. For pattern, 1.234 would be a real note.

Question 17 of 20
1.0 Points

 

Accepted characters: sums, decimal object markers (conclusion or comma), memorial indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in philosophical notation). NOTE: For philosophical notation, a conclusion MUST be used as the decimal object marker.
Complex sums should be in the create (a + bi) where "a" and "b" insufficiency to keep lucidly normal appreciates.
For pattern: {1+1i} is strong when-in-fact {1+i} is not. {0+9i} is strong when-in-fact {9i} is not.
A examine states that mint chocolate bit is the cosset ice gist zest of 6% of consumers. An ice gist stock states that of 260 customers, 20 customers normal their satisfaction for mint chocolate bit.
Find the P-appreciate that would be used to state if the percentage of customers who further mint chocolate bit ice has increased at a 5% smooth of middleing.
P-value: Round your counterpart to immodest decimal places as needful.


Part 3 of 3 -

 

Question 18 of 20
1.0 Points

If a trifling fancy environing a population middle is excludeed at the 0.025 smooth of middleing, then it must so be excludeed at the 0.01 smooth.

 

True

False


Question 19 of 20
1.0 Points

A low p–appreciate prepares illustration for accepting the trifling fancy and excludeing the opinion.

 

True

False


Question 20 of 20
1.0 Points

Sample illustration is statistically memorialificant at the  smooth barely if the p–appreciate is larger than  .

 

True

False