Use the Following to Answer the Question(s) Below

question 60

Multiple Choice

Use the following to answer the question(s) below.
A manufacturer of cordless electric shavers sampled 13 from a day's production and found the mean time of continuous usage without recharging to be 410 minutes with a sample standard deviation of 30 minutes. We can assume that times are normally distributed. We wish to test if the true mean operating time without recharging is more than 400 minutes.
-The correct conclusion at the 0.05 level of significance is

• A) reject the null hypothesis.
• B) fail to reject the null hypothesis, and there is no evidence that true mean operating time without recharging is more than 400 minutes.
• C) evidence suggests that the mean operating time is more than 400 minutes.
• D) reject the null hypothesis and find that evidence suggests that the mean operating time is more than 400 minutes.
• E) do not reject the alternative hypothesis and find that evidence suggests that the mean operating time is more than 400 minutes.

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