Question

In 2012, the mean weight of women was reported at ?2012 = 162 lbs. Suppose that an investigator hypothesizes that weights are even higher in 2015. She collected a sample of 29 women in the year of 2015, from which she measured a mean weight of 158 lbs with a standard deviation of 10 lbs. An two-tailed alpha level = .05 is applied. Select ALL correct statement(s) below: The investigator aims to compare a sample mean (2015) to a population mean (2012). A one-sample t test should be used to test this hypothesis. The degrees of freedom for this test is 28. The critical value for this test is 2.048 Based on the obtained t statistic and the critical t statistic, the investigator fails to reject the null hypothesis. The conclusion of this study is: in 2015, women's mean weight is significantly different from that in 2012.

          In 2012, the mean weight of women was reported at ?2012 = 162 lbs. Suppose that an investigator hypothesizes that weights are even higher in 2015. She collected a sample of 29 women in the year of 2015, from which she measured a mean weight of 158 lbs with a standard deviation of 10 lbs. An two-tailed alpha level = .05 is applied.

Select ALL correct statement(s) below:

The investigator aims to compare a sample mean (2015) to a population mean (2012).

A one-sample t test should be used to test this hypothesis.

The degrees of freedom for this test is 28.

The critical value for this test is 2.048

Based on the obtained t statistic and the critical t statistic, the investigator fails to reject the null hypothesis.

The conclusion of this study is: in 2015, women's mean weight is significantly different from that in 2012.

In 2012, the mean weight of women was reported at ?2012 = 162 lbs. Suppose that an investigator hypothesizes that weights are even higher in 2015. She collected a sample of 29 women in the year of 2015, from which she measured a mean weight of 158 lbs with a standard deviation of 10 lbs. An two-tailed alpha level = .05 is applied.

Select ALL correct statement(s) below:

The investigator aims to compare a sample mean (2015) to a population mean (2012).

A one-sample t test should be used to test this hypothesis.

The degrees of freedom for this test is 28.

The critical value for this test is 2.048

Based on the obtained t statistic and the critical t statistic, the investigator fails to reject the null hypothesis.

The conclusion of this study is: in 2015, women's mean weight is significantly different from that in 2012.

Added by Raul S.

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