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

**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?

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

**Part C) **What is the value of α?

**Answer: **Answer

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

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

**Answer: **Answer

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

**Answer: **Answer