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STAT 015 - Introduction to StatisticsAutumn 2012Tutorial 2PROBLEM SOLVINGQuestion 1 (2.15)The GMAT scores from a sample of 50 applicants to an MBA program indicate that none ofthe applicants scored below 450. A frequency distribution was formed by choosing classintervals 450 to 499, 500 to 549, and so on, with the last class having an interval from 700 to749. Two applicants scored in the interval 450 to 499, and 16 scored in the interval 500 to549.a.What percentage of applicants scored below 500?b.What percentage of applicants scored between 500 and 549?c.What percentage of applicants scored below 550?d.What percentage of applicants scored below 750
Using a level of significance of .10, is there evidence that the population mean weight of the candy bars is greater than 7.3? Explain.
Rose records how long it takes him to drive to UCI every day for a month.
Test for significant differences among weight losses for the five diets, and perform all pair wise comparisons using:
The mean time for the completion of a shopping center is estimated to be 14 months with standard deviation = 4 months. What is the probability that the renters will not be able to move in 19 months?
The average cost of repairing a VCR is $80 with a standard deviation of 19. if one VCR is repaired, find the probability the cost is between 70 and 90.
Mean 1400 grams and standard deviation 20 grams. Find positive numbers a and b such that Y=a+bX has a mean 0 and standard deviation.
What is the distinction between distribution-free methods and nonparametric methods?
A polling organization plans to sample 1000 adult Americans to estimate the proportion of Americans who think crime is a serious problem in this country. (a) What is the parameter of interest to the polling organization? (b) What will be the stati..
The level of satisfaction in a consumer survey would represent what level of measurement?
Develop a linear trend equation for the time series. Graph the time series and the linear trend equation. What appears to be happening to capital expenditures? What is the forecast one year, or four quarters, into the future?
The same survey was mailed to 500 adults aged 25–34 without the gift certificate. There were 65 responses from the first group and 45 from the second group. (a) Perform a two-tailed test comparing the response rates (proportions) at α = .05
The following data refers to gross earned income, in thousands of dollars per year, and level of taxation on that income.
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