AnswersCA-Statistics and Probability BPreparing to Estimate a Population Proportion

Estimating a Population Proportion Answers

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21
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(0.318, 0.382)(0.33, 0.37)✔ (0.618, 0.682)(0.649, 0.651)

A
(0.318, 0.382)
B
(0.33, 0.37)
C
(0.618, 0.682)
D
(0.649, 0.651)
22
Free Preview

(0.09, 0.23)✔ (0.077, 0.243)(0.051, 0.27)(0.037, 0.177)

A
(0.09, 0.23)
B
(0.077, 0.243)
C
(0.051, 0.27)
D
(0.037, 0.177)
23

✔ who plan to attend promwho attended promwho did attend promin the sample who plan to attend prom

Answer not available
24

✔ who have a computerwho had a computerwho did have a computerin the sample who had a computer

A
who have a computer
B
who had a computer
C
who did have a computer
D
in the sample who had a computer
25

✔ that containthat containedthat did containin the sample that contained

A
that contain
B
that contained
C
that did contain
D
in the sample that contained
26

An inspector at a popcorn factory selects a random sample of 75 bags of popcorn from the hundreds produced each hour and finds that 12 contain at least 10% unpopped kernels. Construct and interpret a 95% confidence interval for the true proportion of popcorn bags that contain at least 10% unpopped kernels.

Answers:
State: confidence interval for the true proportion of popcorn bags that contain at least 10% unpopped kernels.:95%
Plan: ; Random: SRS; 10%: is less than 10% of all bags of popcorn produced; Large Counts: 12 successes and 63 failures ≥ 10.:one-sample z-interval for p
Do::(0.077, 0.243)
Conclude: We are 99% confident that the interval from includes the true proportion of all bags of popcorn at least 10% unpopped kernels.:(0.077, 0.243)
Conclude: We are 99% confident that the interval from includes the true proportion of all bags of popcorn at least 10% unpopped kernels.:that contain
27

According to a recent random survey of 3,728 US adults, 1,939 report using their cell phones to play online games. Construct and interpret a 95% confidence interval for the proportion of US adults who use their cell phones to play online games.

Answers:
State: confidence interval for the true proportion of US adults who use their cell phones to play online games.:95%
Plan: ; Random: Random survey; 10%: 3,728 is less than 10% of all US adults; Large Counts: 1,939 successes and 1,789 failures ≥ 10.:one-sample z-interval for p
Do::(0.504, 0.536)
Conclude: We are 95% confident that the interval from includes the true proportion of all US adults to play online games.:(0.504, 0.536)
Conclude: We are 95% confident that the interval from includes the true proportion of all US adults to play online games.:who use their cell phones
28

✔ one-sample z-interval for ptwo-sample z-interval for pone-sample t-interval for mutwo-sample t-interval for mu

A
✔ one-sample z-interval for p
B
two-sample z-interval for p
C
one-sample t-interval for mu
D
two-sample t-interval for mu
29

(0.464, 0.496)(0.499, 0.541)✔ (0.504, 0.536)(0.519, 0.520)

A
(0.464, 0.496)
B
(0.499, 0.541)
C
✔ (0.504, 0.536)
D
(0.519, 0.520)
30

(0.464, 0.496)(0.499, 0.541)✔ (0.504, 0.536)(0.519, 0.520)

A
(0.464, 0.496)
B
(0.499, 0.541)
C
✔ (0.504, 0.536)
D
(0.519, 0.520)
31

✔ who use their cell phoneswho used their cell phoneswho did use their cell phoneswho would have used their cell phones

A
✔ who use their cell phones
B
who used their cell phones
C
who did use their cell phones
D
who would have used their cell phones
32

✔ one-sample z-interval for ptwo-sample z-interval for pone-sample t-interval for mutwo-sample t-interval for mu

A
✔ one-sample z-interval for p
B
two-sample z-interval for p
C
one-sample t-interval for mu
D
two-sample t-interval for mu
33

(0.046, 0.075)(0.075, 0.112)(0.53, 0.762)✔ (0.549, 0.744)

A
(0.046, 0.075)
B
(0.075, 0.112)
C
(0.53, 0.762)
D
✔ (0.549, 0.744)
34

(0.046, 0.075)(0.075, 0.112)(0.53, 0.762)✔ (0.549, 0.744)

A
(0.046, 0.075)
B
(0.075, 0.112)
C
(0.53, 0.762)
D
✔ (0.549, 0.744)
35

✔ who plan to attend promwho attended promwho did attend promin the sample who plan to attend prom

A
✔ who plan to attend prom
B
who attended prom
C
who did attend prom
D
in the sample who plan to attend prom
36

✔ one-sample z-interval for ptwo-sample z-interval for pone-sample t-interval for mutwo-sample t-interval for mu

A
✔ one-sample z-interval for p
B
two-sample z-interval for p
C
one-sample t-interval for mu
D
two-sample t-interval for mu
37

(0.318, 0.382)(0.33, 0.37)✔ (0.618, 0.682)(0.649, 0.651)

A
(0.318, 0.382)
B
(0.33, 0.37)
C
✔ (0.618, 0.682)
D
(0.649, 0.651)
38

(0.318, 0.382)(0.33, 0.37)✔ (0.618, 0.682)(0.649, 0.651)

A
(0.318, 0.382)
B
(0.33, 0.37)
C
✔ (0.618, 0.682)
D
(0.649, 0.651)
39

✔ who have a computerwho had a computerwho did have a computerin the sample who had a computer

A
✔ who have a computer
B
who had a computer
C
who did have a computer
D
in the sample who had a computer
40

✔ one-sample z-interval for ptwo-sample z-interval for pone-sample t-interval for mutwo-sample t-interval for mu

A
✔ one-sample z-interval for p
B
two-sample z-interval for p
C
one-sample t-interval for mu
D
two-sample t-interval for mu

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