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- September 13, 2020
- By menge

**For the numerical questions below, express your answers in four decimal places.**

Past experience indicates that average download times of an online newspaper via a browser on mobiles is normally distributed with a mean of 0.92 seconds and a population standard deviation of 0.74 seconds. After an advertising campaign aimed at showing the benefits of a new nationwide 4G network, the manager of a telecommunications firm took a random sample of 24 customers and recorded their average download times. The manager found the sample average to be 0.67 seconds. The manager is looking to conduct a statistical test at the 10% level of significance to determine whether the campaign lowered mean download times.

**Part A) **What is the null hypothesis?

H0: ? ? 0.92H0: ? < 0.92H0: ? = 0.67H0: ? ? 0.67H0: X?? 0.92

**Part B) **What is the alternate hypothesis?

H1: ? < 0.92H1: ? ? 0.92H1: ? ? 0.67H0: ? < 0.67H0: X?< 0.92

**Part C) **What is the value of ??

**Answer: **Answer

**Part D) **What is the sampling distribution of the sample mean?

The sampling distribution is normal since the population standard deviation is known.The sampling distribution is a student-t since the population standard deviation is known.There is not enough information to answer this question.

**Part E) **What is the value of the test statistic?

**Answer: **Answer

**Part F) **What is the p-value?

**Answer: **Answer