Question: Answer both parts. a. A researcher obtained a random sample of 75 teenagers from the United States. She had each teenager keep track of how

Answer both parts.

a. A researcher obtained a random sample of 75 teenagers from the United States. She had each teenager keep track of how many times he or she checked his or her phone for texts or tweets during one 24-

hour period. Given M = 157 and s = 32, calculate the 95% confidence interval for the population mean for the number of times a teenager checks.

b. Explain what this confidence interval means.

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