A study indicates that 90% of American teenagers have tattoos. You randomly sample 25 teenagers. Find...

A study indicates that 90% of American teenagers have tattoos. You randomly sample 25 teenagers. Find the probability that less than 19 will have tattoos. Round your answer to 4 decimal places.

Expert Solution

orchestra answered 2 years ago

Suppose you have been hired to study Guinea. You randomly sample 30 Guineans and find that...

Suppose you have been hired to study Guinea. You randomly sample 30 Guineans and find that that they make on average $970 and that 23 of them speak French. (Suppose that there is good reason to believe that σ = $75) a) You are asked to determine if Guineans make on average less than $1000.Test the hypothesis at the 5% significance level using the rejection region approach. b) Determine the p-value for the test in part (a). What can you...

In a random sample of 125 students, you find that 15 have tattoos (that’s 12%). Construct...

In a random sample of 125 students, you find that 15 have tattoos (that’s 12%). Construct a 95% confidence interval for the true population proportion of students that have tattoos.

1. You have sampled 25 randomly selected students to find the mean test score. A 95%...

1. You have sampled 25 randomly selected students to find the mean test score. A 95% confidence interval for the mean came out to be between 85 and 92. Which of the following statements gives a valid interpretation of this interval? 1)If this procedure were to be repeated many times, 95% of the confidence intervals found would contain the true mean score. 2)If 100 samples were taken and a 95% confidence interval were found, 95 of them would be between...

Suppose you randomly sample 64 cans and find the mean amount of Coke in this sample...

Suppose you randomly sample 64 cans and find the mean amount of Coke in this sample is 11.85 ounces and the standard deviation is 0.35 ounces. Construct a 95% confidence interval estimate for the mean amount of Coke in the all such cans.

A sample of 25 items provides a sample standard deviation of 6. (a) Compute the 90%...

A sample of 25 items provides a sample standard deviation of 6. (a) Compute the 90% confidence interval estimate of the population variance. (Round your answers to two decimal places.) ____ to ____ (b) Compute the 95% confidence interval estimate of the population variance. (Round your answers to two decimal places.) _____to _____ (c) Compute the 95% confidence interval estimate of the population standard deviation. (Round your answers to one decimal place.) _____to ____

Suppose 90% of a sample of 100 randomly selected homes in Town A and 80% of...

Suppose 90% of a sample of 100 randomly selected homes in Town A and 80% of a sample of 50 randomly selected homes in Town B rely on the public water supply for drinking water. Compute the test statistic for a hypothesis test to compare the population proportion of homes that rely on the public water supply for drinking water in Town A to the proportion in Town B. Assume that the conditions for a hypothesis test for the difference...

Of 94 adults selected randomly from one town, 62 have health insurance. Find a 90% confidence...

Of 94 adults selected randomly from one town, 62 have health insurance. Find a 90% confidence interval for the proportion of all adults in the town who have health insurance.

A random sample of 120 observations results in 90 successes. [You may find it useful to...

A random sample of 120 observations results in 90 successes. [You may find it useful to reference the z table.] a. Construct the 90% confidence interval for the population proportion of successes. (Round intermediate calculations to at least 4 decimal places. Round "z" value and final answers to 3 decimal places.) Confidence interval _____ to _____ b. Construct the 90% confidence interval for the population proportion of failures. (Round intermediate calculations to at least 4 decimal places. Round "z" value...

#9 find the minimum sample size for the following. you wish to estimate 90% confidence and...

#9 find the minimum sample size for the following. you wish to estimate 90% confidence and within 3% of the true population, the proportion of senior citizens that need to be treated for heart disease. there is no initial estimate for p-hat (Hint: think half and half) Show all work. #10 using the data from #9 - if there was an initial estimate of 30%, what would be the minimum sample size?

A recent study examined hearing loss data for 1666 U.S. teenagers. In this sample, 307 were...

A recent study examined hearing loss data for 1666 U.S. teenagers. In this sample, 307 were found to have some level of hearing loss. News of this study spread quickly, with many news articles blaming the prevalence of hearing loss on the higher use of ear buds by teens. At MSNBC.com (8/17/2010), Carla Johnson summarized the study with the headline: “1 in 5 U.S. teens has hearing loss, study says.” To investigate whether this is an appropriate or a misleading...

Question