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To test the hypothesis that students who finish an exam first get better grades, Professor Hardtack kept track of the order in which papers were handed in. The first 25 papers showed a mean score of 77.1 with a standard deviation of 19.6, while the last 24 papers handed in showed a mean score of 69.3 with a standard deviation of 24.9. Is this a significant difference at a=.05? (a) state the hypotheses for a right-tailed test. (b) obtain a test statistic and p-value assuming equal variance. Interpret these results (c) is the difference in mean scores large enough to be important? (d) is it reasonable to assume equal variances? (e) carry out a formal test for equal variances at a=.05, showing all steps clearly.
A parent is deciding which babysitter to use in the neighborhood. Babysitter A charges $20 per hour and a base rate of $60 per day. Babysitter B charges a base rate of $50 per day and $25 per hour.
If the least squares equation for sales data going from 1984 to 1990 is Y1 = 10 + 1.3X (in $ millions) found using the coded method, what is the plot on the straight line for 1988? (x and y values)
Assuming the sensitivity and specificity of the screening test are the same, which of the following statements about positive predictive value (PPV) applies.
The data was used to make inferences regarding the other students taking the course. Construct a 95% confidence interval estimate. Explain your findings so that your non-quantitative partner will understand them. Their data is below:
Privacy Are your finances, buying habits, medical records, and phone calls really private? A real concern for many adults is that computers and Internet are reducing privacy. A survey conducted by Peter D.
If the mean number of serious accidents per year in a large factory (where the number of employees remains constant) is five, find the probability that in the current year there will be:
The tail probabilities given above be affected if the > signs in the inequalities were replaced by ? Explain briefly. Why are the absolute value signs used in the two-tail probability expressions above?
What is approximately the largest sample mean of another sample of n= 16 participants you would expect to obtain from this finite population?
Use poisson approximation to the binomial distribution to find the probability that among 120 calls recieved by the switchboard.
Eight randomly selected plants have heights 172, 156, 154, 163, 170, 169, 170 and 164 cms. Test whether the sample standard deviation differs significantly?
Such things as historical documents, newspaper reports, TV and radio broadcasts, when used in research, represents
Set up the null and alternative hypotheses, and perform the hypothesis test with a significance level of 0.05.
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