Use of Texting. TextRequest reports that adults 18–24 years old send and receive 128 texts every day. Suppose we take a sample of 25–34 year olds to see if their mean number of daily texts differs from the mean for 18–24 year olds reported by TextRequest.a. State the null and alternative hypotheses we should use to test whether the population mean daily number of texts for 25–34 year olds differs from the population daily mean number of texts for 18–24 year olds.b. Suppose a sample of thirty 25–34 year olds showed a sample mean of 118.6 texts perday. Assume a population standard deviation of 33.17 texts per day and compute the pvalue.c. With α = .05 as the level of significance, what is your conclusion?d. Repeat the preceding hypothesis test using the critical value approach.
Use of Texting. TextRequest reports that adults 18–24 years old send and receive 128 texts every day. Suppose we take a sample of 25–34 year olds to see if their mean number of daily texts differs from the mean for 18–24 year olds reported by TextRequest.
a. State the null and alternative hypotheses we should use to test whether the population mean daily number of texts for 25–34 year olds differs from the population daily mean number of texts for 18–24 year olds.
b. Suppose a sample of thirty 25–34 year olds showed a sample mean of 118.6 texts perday. Assume a population standard deviation of 33.17 texts per day and compute the pvalue.
c. With α = .05 as the level of significance, what is your conclusion?
d. Repeat the preceding hypothesis test using the critical value approach.
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