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A neuropsychologist compare the auditory abilities of blind versus normally sighted rats. He predicted that the visually impaired rats would have better auditory development than normally sighted rats. He raises two groups of rats for a year (one normally sighted, one blind) and assessed auditory development by examining the neural activity in the auditory cortex of each rat.
Name the following:
Independent variable:
Levels of the independent variable:
Dependent variable:
If we assume that the lifetime of this type of bulb has a standard deviation of 400 hours, can we conclude at the 5% significance level that the claim is true.
Determine the expected frequencies for each of the cells in the following contingency tables. For each problem, state how many of the expected values actually had to be computed and how many could be found by subtraction.
Determine fraction of employees cost between $1,500 and $2,000 per year?
Make an interval estimate the population means score for the daycare children so that you are 95% confident that the true mean is in your interval.
A five-star hotel accepts 100 room reservations daily. For each reservation accepted, there is a 7% chance that the guest will not arrive.
Let's play a game. An urn contains five red, four green and one gold ball other than color, the balls are identical. You are blindfolded and allowed to pick a ball from the urn. Red pays $5, green pays $10 and gold pays $50.
Pretest-posttest design and internal validity threats - please discuss all threats to internal validity.
Using Sally's estimate of demand that follows, how many T-shirts should she produce for the upcoming event?
We wish to create this mean value interval for selling price with 95% confidence level. Find out the best point estimate (average) for selling price. Critical t-value(s) associated with 95% confidence level.
Conduct the following test using 95% level of confidence.
Perform the appropriate test for a difference in mean blood glucose and report the p-value for the two-tailed test of significance, assuming that the variances are equal.
Examine the residual files and produce appropriate residual plots to examine the assumptions. Are the Level-1 residuals normally distributed? Are the level-2 residuals multivariate normal? How do you know?
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