A professor is interested in how attendance influences grades her class. She goes through her records and determines each student’s final average and the number of days absent. The scores for her sample are given in the table below. Estimate the average final grade for all students in the professor’s class. Provide a point estimate and a 99% confidence interval. Estimate the average number of days all students are absent from the class. Provide a point estimate and a 95% confidence interval.

For each problem, you must state the hypotheses, calculate the test statistic, and explain your decision. The following table reports the relationship between class standing and political orientation for a random sample of 267 college students.   a. The table is constructed assuming that class standing is the independent variable.  Please add %s in the appropriate position (columns or rows) to describe the pattern of the relationship. b. Is there a statistically significant relationship between these variables?

A contributor for the local newspaper is writing an article for the weekly fitness section. To prepare for the story, she conducts a study to compare the exercise habits of people who exercise in the morning to the exercise habits of people who work out in the afternoon or evening. She selects three different health centers from which to draw her samples. The 56 people she sampled who work out in the morning have a mean of 4.4 hours of exercise each week. The 63 people surveyed who exercise in the afternoon or evening have a mean of 4.2 hours of exercise each week. Assume that the weekly exercise times have a population standard deviation of 0.8 hours for people who exercise in the morning and 0.7 hours for people who exercise in the afternoon or evening. Let Population 1 be people who exercise in the morning and Population 2 be people who exercise in the afternoon or evening.   Step 1 of 2: Construct a 99% confidence interval for the true difference between the mean amounts of…

Please help find the tstat. Thanks.