I. If there is sufficient evidence to reject a null hypothesis at the 10% level, then there is sufficient evidence to reject it at the 5% level. II. Whether to use a one- or two-tailed test is typically decided after the data are gathered. III. If a hypothesis test is conducted at the 1% level of significance, there is a 1% chance of rejecting the null hypothesis. A. I only B. III only C. I and III only D. None of the above. A soft drink dispenser can be adjusted to deliver any fixed number of ounces of soft drink. If the machine is operating with a standard deviation of 0.3 ounces, what should the mean setting be so that a 12-ounce cup will overflow less than 1% of the time? Assume a normal distribution for ounces delivered. A. 11.23 oz. B. 11.30 oz. C. 11.70 oz. D. 12.70 oz. When a true null hypothesis is rejected in a hypothesis tes
Which of the following statements are true?
I. If there is sufficient evidence to reject a null hypothesis at the 10% level, then there is sufficient evidence to reject it at the 5% level.
II. Whether to use a one- or two-tailed test is typically decided after the data are gathered.
III. If a hypothesis test is conducted at the 1% level of significance, there is a 1% chance of rejecting the null hypothesis.
A. I only B. III only C. I and III only D. None of the above.
A soft drink dispenser can be adjusted to deliver any fixed number of ounces of soft drink. If the machine is operating with a standard deviation of 0.3 ounces, what should the
A. 11.23 oz. B. 11.30 oz. C. 11.70 oz. D. 12.70 oz.
When a true null hypothesis is rejected in a hypothesis test, the researcher or analyst has
A. committed a Type I error
B. committed a Type II error
C. made the correct decision.
D. to perform the study again.
A tire manufacturer claims that its tires have a mean life of at least 50000 km. A random sample of 25 of these tires is tested and the mean life is 33000 km. Suppose the population standard deviation is 2500 km and the lives of tires is approximately normal. To test the manufacturer’s claim at the 5% level of significance, the analyst should
A. perform a right-tailed test using the t statistic.
B. perform a left-tailed test using the t statistic.
C. perform a right-tailed test using the z statistic.
D. perform a left-tailed test using the z statistic.
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