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Fifteen people will be enrolled in a four-week foreign language course. On the first day, the instructor gives the students an exam to determine how much they already know. At the end of the four weeks, the instructor gives the students the same exam again. From the exam scores, the instructor wants to determine if taking the course has significantly increased the students' foreign language ability. Which of the four cases in Chapter 10 does this problem fall under or represent? A. Case I - Use z statistic with known population variances
B. Case II - Use t statistic, assuming variances are unknown but equal C. Case III -Use t statistic, assuming variances unknown and unequal D. Case IV - Use paired t test
assuming all test scores are different you would like to determine the relative test scores of three classmates using
What is the null hypothesis? What is your decision if a = 0.01?
A department store, on average, has daily sales of $28,707.47. The standard deviation of sales is $1000. On Tuesday, the store sold $34,650.77 worth of goods. Find Tuesday's z score. Was Tuesday an unusually good day?
Construct a hypothetical 95% confidence interval for a hypothetical case
1) There are 500 employees in a firm, 45% are female. A sample of 60 employees is selected randomly. a) Determine the standard error of the proportion.
The Dean of Students believes that the costs are greater this semester. What is the test value for this hypothesis?
Determine the critical path and project completion time.
Given that the mean of 100 observations is 42.5 and that their standard deviation is 6.313, find the sum of the squares of the observations.
Which conditional distributions do these statistics refer to, those of y at given catagories of x, or those of x at given categories of y? Set up a table with race of murderers as rows and race of victims as columns, showing the two conditional di..
You are interested in evaluating a new treatment for heart disease. (a) Discribe the population of interest. (b) Describe how you might obtain a random sample.
Identify a research issue, problem, or opportunity that uses data that has absolute zero measurements, ratio level data.
in basketball a players free throws percentage ft is expressed as a number between 0 and 1 which represents the
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