You created a new self-esteem program and you are interested in testing its impact on self-esteem. To do so, you recruit a sample of participants and have them complete a self-report self-esteem scale before participating in the intervention and then after participating in the intervention. The self-esteem skills scale has multiple items and includes a Likert type scale (none of the time – all of the time), so we know the level of measurement for this variable is interval. What type of test can be used to analyze the data? Group of answer choices Independent t-test Dependent t-test Simple ANOVA Chi square

You want to estimate the percentage of statistics students who get grades of C or better. How many students should you survey to be 95% confident that the sample percentage is off by no more than 2 percentage points.

We have provided simple data sets for you to practice finding the descriptive measures discussed in this section. For each data set, a. obtain the quartiles. b. determine the interquartile range. c. find the five-number summary. 1, 2, 3, 4

You need to use Stata to look up the dataset and its variables. Use Stata Companion Textbook. (Dataset: NES. Variables: spend8, [pw=nesw].) The NES dataset contains spend8, which records the number of government policy areas where respondents think spending should be increased. Scores range from 0 (the respondent does not want to increase spending on any of the policies) to 8 (the respondent wants to increase spending on all eight policies). The NES, of course, polls a random sample of U.S. adults. In this exercise you will analyze spend8 using the mean and lincom commands. You then will draw inferences about the population mean. (Remember to specify nesw as the probability weight.) The spend8 variable has a sample mean of ______. Make sure you use [pw=nesw] so your results are nationally representative. There is a probability of .95 that spend8’s true population mean falls between a score of ______ at the low end and a score of ______ at the high end. A student researcher…