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The average gas mileage of a certain model car is 28.0 miles per gallon. If the gas mileages are normally distributed with a standard deviation of 0.45 miles per gallon, find the probablilty that a car has a gas mileage of between 27.8 and 28.2 miles per gallon.
Mean weekly computer usage time of 8.5 hours and that from prior studies, the population standard deviation is assumed to be σ = 3.6 hours. Based on this information, what would be the point estimate for μ?
Sketch a graph and shade the area of interest. SCores on a standardized exam are normally distributed with u = 60 and o = 5.
Determine the percentage of defective washers produced by this machine, assuming the diameters are normally distributed.
For the samples summarized below, test the hypothesis at ∞ =.05 that the two variances are equal. Variance Number of data values Sample 1 19 8 Sample 2 9 18
Compute Cohen's d to measure effect size for both test ( standard deviation 20 and 10) If the population standard deviation is 10.
A researcher wishes to construct a 95% confidence interval for a population mean. She selects a simple random sample of size n=20 from the population.
Give an example of a repeated measures analysis of variance (ANOVA)--no examples of therapy or temperature.
According to the U.S National Center for Health Statistics, the mean height for adult American males is mu = 65.5 inches. Assume the heights are normally distributed with standard deviation of sigma = 3.2.
The critical value of F at 95% confidence when there is a sample size of 21 for the sample with the smaller variance, and there is a sample size of 9 for the sample with the larger sample variance is:
You obtain the data shown below for 30 girls with anorexia who were treated with psychodynamic therapy. Using the data below and the data above compare the outcomes for CBT and psychodynamic therapy.
Determine the probability the sample of 40 will have a sales average less than $400,000.
If you know you need a sample size of 1,063 out of 300,000 to get a 95% confidence level and a 3% confidence interval what steps would you take to get a random sample?
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