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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
Keith's florist has 18 delivery trucks used mainly to deliver flowers in the SC area. Of these 18 trucks, 5 have brake problems. A sample of 4 trucks is randomly selected. What is the probability that 2 of those defective have defective braked. Ro..
Now suppose that a finished product is randomly selected. What is the probability that it is defective?
Illustrate by computation that, for straight -line regression of Y on x, β1= 0.
Estimate the percentage of adult Internet shoppers in order to determine the maximum impact of Internet shoppers on its sales, what percentage of Internet shoppers should be used?
A month is classified as extremely wet if the amount of rainfall is in the upper 10% for that month. How much precipitation must fall before a month of April is classified as extremely wet?
deliverable length 500-1000 wordscompany w is testing a sales software package. their sales force of 500 people is
Plot the sales data as a time series and do you think this series is stationary or nonstationary
Complete the simulation Applying Time Series Methodologies located on . During the third cycle of the simulation, you will need to make a decision regarding sales forecasts for Blues Inc.
To findout 95 percent with confidence interval for the mean amount a citation. Police Chief Aaron Ard of River City reports 500 traffic citations were issued last month.
Suppose the manufacturers claim is right, determine the probability the mean of sample is 47,840 miles or less?
Determine the percentage of samples of size 4 that will have the mean scores within 35 points of the population mean score of 280.
Many times researchers preselect the value of alpha of .01 or .001. What are the factors that allow selection of either of those levels of significance?
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