a team of researchers wants to investigate whether an app presenting a motivational saying daily will encourage adults to exercise more. a group of 82 adults with were recruited in the study, they reported total hours of exercise in the past week, committed to using the app each day for 3 weeks, and, at the end of the study, reported total hours of exercise in the past week. the mean difference in total exercise hours before and after the study was 1 with a standard deviation of 0.5. which one of the following statements is incorrect? (set alpha level at 0.05.) A. The null hypothesis is that hours of exercise remain the same before and after the study. B. The degrees of freedom is 81 C. The obtained test statistic is 1.811 D. The decision should be to reject the null hypothesis

A type of statistical hypothesis known as a "null hypothesis" makes the case that a given set of observations does not have any statistical significance. Using sample data, hypothesis testing is used to determine a hypothesis's credibility. It is represented as H0, and it is sometimes referred to as the "null."

How is the null hypothesis determined?

The assertion that there is no effect on the population is known as the null hypothesis. We can reject the null hypothesis if the sample provides sufficient evidence to support the claim that there is no effect in the population (p ).

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