Question

1-

Listed below are the amounts of net worth​ (in millions of​ dollars) of the ten wealthiest celebrities in a country. Construct a

9999​%

confidence interval. What does the result tell us about the population of all​ celebrities? Do the data appear to be from a normally distributed population as​ required?

251251

199199

187187

162162

162162

157157

146146

146146

141141

141141

What is the confidence interval estimate of the population mean

muμ​?

​$nothing

millionless than<muμless than<​$nothing

million

​(Round to one decimal place as​ needed.)

What does the result tell us about the population of all​ celebrities? Select the correct choice below​ and, if​ necessary, fill in the answer​ box(es) to complete your choice.

A.We are

9999​%

confident that the interval from

​$nothing

million to

​$nothing

million actually contains the true mean net worth of all celebrities.

​(Round to one decimal place as​ needed.)

B.Because the ten wealthiest celebrities are not a representative​ sample, this​ doesn't provide any information about the population of all celebrities.

C.we are confident that

9999​%

of all celebrities have a net worth between

​$nothing

million and

​$nothing

million.

​(Round to one decimal place as​ needed.)

Do the data appear to be from a normally distributed population as​ required?

A.

​Yes, but the points in the normal quantile plot do not lie reasonably close to a straight line or show a systematic pattern that is a straight line pattern.

B.

​Yes, because the pattern of the points in the normal quantile plot is reasonably close to a straight line.

C.

​No, because the points lie reasonable close to a straight​ line, but there is a systematic pattern that is not a straight line pattern.

D.

​No, but the points in the normal quantile plot lie reasonably close to a straight line and show some systematic pattern that is a straight line pattern.

2-

A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before​ treatment,

1515

subjects had a mean wake time of

105.0105.0

min. After​ treatment, the

1515

subjects had a mean wake time of

80.780.7

min and a standard deviation of

20.520.5

min. Assume that the

1515

sample values appear to be from a normally distributed population and construct a

9090​%

confidence interval estimate of the mean wake time for a population with drug treatments. What does the result suggest about the mean wake time of

105.0105.0

min before the​ treatment? Does the drug appear to be​ effective?

Construct the

9090​%

confidence interval estimate of the mean wake time for a population with the treatment.

nothing

minless than<muμless than<nothing

min

​(Round to one decimal place as​ needed.)

What does the result suggest about the mean wake time of

105.0105.0

min before the​ treatment? Does the drug appear to be​ effective?The confidence interval

▼

does not include

includes

the mean wake time of

105.0105.0

min before the​ treatment, so the means before and after the treatment

▼

are different.

could be the same.

This result suggests that the drug treatment

▼

has

does not have

a significant effect.

Answer 1