# Question: An earlier study claimed that U S adults spent an average

An earlier study claimed that U.S. adults spent an average of 114 minutes per day with their family. A recently taken sample of 25 adults from a city showed that they spend an average of 109 minutes per day with their family. The sample standard deviation is 11 minutes. Assume that the times spent by adults with their family have an approximate normal distribution.

a. Using a 1% significance level, test whether the mean time spent currently by all adults with their families in this city is different from 114 minutes a day.

b. Suppose the probability of making a Type I error is zero. Can you make a decision for the test of part a without going through the five steps of hypothesis testing? If yes, what is your decision?

Explain.

a. Using a 1% significance level, test whether the mean time spent currently by all adults with their families in this city is different from 114 minutes a day.

b. Suppose the probability of making a Type I error is zero. Can you make a decision for the test of part a without going through the five steps of hypothesis testing? If yes, what is your decision?

Explain.

**View Solution:**## Answer to relevant Questions

A computer company that recently introduced a new software product claims that the mean time taken to learn how to use this software is not more than 2 hours for people who are somewhat familiar with computers. A random ...In a poll conducted by The New York Times and CBS News, 44% of Americans approve of the job that the Supreme Court is doing (The New York Times, June 8, 2012). Assume that this percentage was true for the population of ...The package of Sylvania CFL 65-watt replacement bulbs that use only 16 watts claims that these bulbs have an average life of 8000 hours. Assume that the standard deviation of lives of these light bulbs is 400 hours. A ...Briefly explain the procedure used to calculate the p-value for a two-tailed and for a one-tailed test, respectively. A random sample of 18 observations produced a sample mean of 9.24. Find the critical and observed values of z for each of the following tests of hypothesis using .05. The population standard deviation is known to be 5.40 ...Post your question