Question
In: Statistics and Probability
A statistician employed by a consumer testing organization reports that at 95% confidence he has determined...
A statistician employed by a consumer testing organization reports that at 95% confidence he has determined that the true average content of the Uncola soft drinks is between 11.7 to 12.3 ounces. He further reports that his sample revealed an average content of 12 ounces, but he forgot to report the size of the sample he had selected. Assuming the standard deviation of the population is 1.28, determine the size of the sample. #9b) About 28% of private companies are owned by women (Cincinnati Enquirer, January 26, 2006). Answer the following questions based on a sample of 240 private companies. #9bi). Show the sampling distribution of (), the sample proportion of companies that are owned by women. #9bii). What is the probability the sample proportion will be within ±.04 of the population proportion?
Solutions
orchestra answered 1 year agoRelated Solutions
At a confidence level of 95% a confidence interval for a population proportion is determined to...
At a confidence level of 95% a confidence interval for a
population proportion is determined to be 0.65 to 0.75. If the
sample size had been larger and the estimate of the population
proportion the same, this 95% confidence interval estimate as
compared to the first interval estimate would be
A. the same
B. narrower
C. wider
A 95% confidence interval estimate for a population mean is determined to be between 94.25 and...
A 95% confidence interval estimate for a population mean is
determined to be between 94.25 and 98.33 years. If the confidence
interval is increased to 98%, the interval would
become narrower
remain the same
become wider
After surveying students at a college, a campus organization calculated that a 95% confidence interval for...
After surveying students at a college, a campus organization
calculated that a 95% confidence interval for the mean cost of
food for one term is ($1372, $1562). Now the organization is
trying to write its report and is considering the following
interpretations. Comment on each. Complete parts a through e
below.
a) 95% of all students pay between $1372 and $1562 for
food.
Comment on the given interpretation. Choose the correct answer
below.
A. The interpretation is incorrect. A confidence...
Using the data in the worksheet Consumer Transportation Survey, develop 95% confidence intervals for the following:...
Using the data in the worksheet Consumer Transportation Survey,
develop 95% confidence intervals for the following:
a. the proportion of individuals who are satisfied with their
vehicle
b. the proportion of individuals who have at least one child
Satisfaction with vehicle
Number of Children
Yes
0
Yes
1
No
0
No
0
Yes
0
Yes
2
Yes
3
Yes
2
Yes
0
Yes
2
Yes
1
Yes
4
No
1
Yes
0
Yes
0
Yes
0
No
1
No
1...
a. We are testing H0: μ1 - μ2 = 0. Our 95% confidence interval is (-27.01,-7.5)....
a. We are testing H0: μ1 - μ2 =
0. Our 95% confidence interval is (-27.01,-7.5).
We should expect the t-statistic to be ---Select---
greater than 2 between 0 and 2 between 0 and -2 less than -2
.
We should expect the p-value to be ---Select--- less
than .05 greater than .05 equal to .05 .
We should ---Select--- reject fail to reject
H0 and conclude that the group 1 population average
is ---Select--- smaller larger than the group 2
population average.
It...
We are testing H0: μ1 - μ2 = 0. Our 95% confidence interval is (-20.82,-7.54) 1)...
We are testing H0: μ1 - μ2 = 0.
Our 95% confidence interval is (-20.82,-7.54)
1) We should expect the t-statistic to be ______.
a) greater than 2
b) between 0 and 2
c) between 0 and -2
d) less than -2 .
2) We should expect the p-value to be ______.
a) less than .05
b) greater than .05
c) equal to .05 .
3) We should (reject fail to / reject )
H0 and conclude that the group...
A consumer product testing organization uses a survey of readers to obtain customer satisfaction ratings for...
A consumer product testing organization uses a survey of readers
to obtain customer satisfaction ratings for the nation's largest
supermarkets. Each survey respondent is asked to rate a specified
supermarket based on a variety of factors such as: quality of
products, selection, value, checkout efficiency, service, and store
layout. An overall satisfaction score summarizes the rating for
each respondent with 100 meaning the respondent is completely
satisfied in terms of all factors. Suppose sample data
representative of independent samples of...
A consumer product testing organization uses a survey of readers to obtain customer satisfaction ratings for...
A consumer product testing organization uses a survey of readers
to obtain customer satisfaction ratings for the nation's largest
supermarkets. Each survey respondent is asked to rate a specified
supermarket based on a variety of factors such as: quality of
products, selection, value, checkout efficiency, service, and store
layout. An overall satisfaction score summarizes the rating for
each respondent with 100 meaning the respondent is completely
satisfied in terms of all factors. Suppose sample data
representative of independent samples of...
A consumer product testing organization uses a survey of readers to obtain customer satisfaction ratings for...
A consumer product testing organization uses a survey of readers
to obtain customer satisfaction ratings for the nation's largest
supermarkets. Each survey respondent is asked to rate a specified
supermarket based on a variety of factors such as: quality of
products, selection, value, checkout efficiency, service, and store
layout. An overall satisfaction score summarizes the rating for
each respondent with 100 meaning the respondent is completely
satisfied in terms of all factors. Suppose sample data
representative of independent samples of...
A consumer product testing organization uses a survey of readers to obtain customer satisfaction ratings for...
A consumer product testing organization uses a survey of readers
to obtain customer satisfaction ratings for the nation's largest
supermarkets. Each survey respondent is asked to rate a specified
supermarket based on a variety of factors such as: quality of
products, selection, value, checkout efficiency, service, and store
layout. An overall satisfaction score summarizes the rating for
each respondent with 100 meaning the respondent is completely
satisfied in terms of all factors. Suppose sample data
representative of independent samples of...
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