nutritionist wants to determine how much time nationally people spend eating and drinking. Suppose for a random sample of 1083 people age 15 or​ older, the mean amount of time spent eating or drinking per day is 1.08 hours with a standard deviation of 0.75

A nutritionist wants to determine how much time nationally people spend eating and drinking. Suppose for a random sample of

1083

people age 15 or​ older, the mean amount of time spent eating or drinking per day is

1.08

hours with a standard deviation of

0.75

hour. Complete parts ​(a) through ​(d) below.

​(a) A histogram of time spent eating and drinking each day is skewed right. Use this result to explain why a large sample size is needed to construct a confidence interval for the mean time spent eating and drinking each day.
 
 

A.

The distribution of the sample mean will always be approximately normal.
 

B.

The distribution of the sample mean will never be approximately normal.
 

C.

Since the distribution of time spent eating and drinking each day is not normally distributed​ (skewed right), the sample must be large so that the distribution of the sample mean will be approximately normal.

Your answer is correct.

 

D.

Since the distribution of time spent eating and drinking each day is normally​ distributed, the sample must be large so that the distribution of the sample mean will be approximately normal.
​(b) There are more than 200 million people nationally age 15 or older. Explain why​ this, along with the fact that the data were obtained using a random​ sample, satisfies the requirements for constructing a confidence interval.
 
 

A.

The sample size is greater than​ 5% of the population.
 

B.

The sample size is less than​ 5% of the population.

Your answer is correct.

 

C.

The sample size is less than​ 10% of the population.
 

D.

The sample size is greater than​ 10% of the population.
​(c) Determine and interpret a

90​%

confidence interval for the mean amount of time Americans age 15 or older spend eating and drinking each day.

 
Select the correct choice below and fill in the answer​ boxes, if​ applicable, in your choice.
​(Type integers or decimals rounded to three decimal places as needed. Use ascending​ order.)
 

A.

The nutritionist is

90​%

confident that the amount of time spent eating or drinking per day for any individual is between

nothing

and

nothing

hours.

 

B.

There is a

90​%

probability that the mean amount of time spent eating or drinking per day is between

nothing

and

nothing

hours.

 

C.

The nutritionist is

90​%

confident that the mean amount of time spent eating or drinking per day is between

nothing

and

nothing

hours.

 

D.

The requirements for constructing a confidence interval are not satisfied.
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