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: μ ≥ 0.92H0: μ < 0.92H0: μ = 0.67H0: μ ≥ 0.67H0: X̄≥ 0.92

Part B) What is the alternate hypothesis?

H1: μ < 0.92H1: μ ≥ 0.92H1: μ ≠ 0.67H0: μ < 0.67H0: X̄< 0.92

Part C) What is the value of α?

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