Statistical analysis of research results obtained in a study investigating how Alzheimer’s patients remember words following a treatment program reveals that t₍₅₈₎ = -.18, p >.05. The participants in the study were assigned into two groups: Group 1 was taught using visuals, and Group 2 was taught using visuals and intense verbal rehearsal. Explain the results of statistical analysis.

As a consumer interested in buying an exercise machine, you come across an advertisement reporting that the mean weight loss after using a certain exercise machine for 2 months was 10 kg. You investigate further and discover that the median weight loss was 3kg. Which information is more useful to you as a measure of the average weight loss? Explain your answer.

Why does the standard deviation get smaller as the individuals in a group score more similarly on a test?

The distribution of scores on a statistics test is positively skewed. What does this indicate about the difficulty of the test? Explain your answer.

Explain what are discrete variables and give one (1) example of a discrete variable.

A report indicates that X brand toothpaste significantly reduced tooth decay relative to other brands, with p < 0.005. What does “significant” indicate about the researcher’s decision about brand X toothpaste?

You are screening anticancer drugs for possible beneficial effects. You know that none of them is harmful, but you are uncertain whether they do any good. If your results are significant for a given drug, it will be the subject of further intensive investigation. If your results are not significant, the investigation will be dropped. Which type of error would you be more concerned about avoiding? Explain your answer.

On a normal distribution of scores, four students obtained the following deviation scores: Mark -5, Jenny 0, Anna +3, and Tom -1. Which student obtained the lowest score? Explain your answer.

In a correlational study, a researcher measured participants’ creativity and their intelligence. She found that the correlation between creativity and intelligence is very high  and concluded that intelligence is a cause of creativity. Does the statistical information support the conclusion? Explain your answer..