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Consider the following results for two samples randomly taken from two populations.
Sample A Sample B
Sample Size 130 130Sample Mean 412 405Sample Standard Deviation 140 80
a. At a .01 level of significance, test whether there is a difference between the 2 sample means (Please show work).
b. Construct a 98 percent confidence interval estimate of the difference between the two sample means (Please show work).
A recent survey by alumni of a major university indicated that average salary of 8000 of its 250,000 graduates was $120,000. Does this signify population parameter or sample statistic?
If there is an outage, there is a .05 probability that the resulting losses will be very large, approximately $ 80 million in lost earnings. Also, it is estimated that there is a .95 probability of only slight losses of around $ 1 million. What is..
Determine the margin of error that corresponds to the given values of n (times) and x (successes) and the degree of confidence: n=1400, x=420, 95%. Go 3 decimal places of precision.
What if the assumption E[u/x]=0 is not satisfied? Illustrate using an example. Explain the relationship represented by a population regression function.
Determine marginal probability distributions of X and Y . Compute conditional probability P ( Y = 2 | X = 1)
Following data from an x bar chart, is the process capable (capability index>1.33)?
For each set of data, calculate mean, median, mode, range, interquartile range, standard deviation, and coefficient of variation.
If the population mean was $1047 in the previous year, does the evidence suggest that expenditure this year has significantly changed?
A new-car dealer is leasing various brand-new models for the monthly rates(in dollars) listed below. Estimate the true population variance and standard deviation in leasing rate with 90% confidence.
One advantage of the repeated measures ANOVA is that it eliminates "individual differences" as a source of variability. Explain why there are no individual differences in the numerator and in the denominator of the F ratio.
The main goal of correlation research is ______________
At a college, 70 percent of the students are women and 35 percent of students receive grade of C. About 20 percent of students are neither female nor C students. Use this contingency table.
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