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A portion of a study by Wechsler (1958) reports that for 100 males taking the Wechsler Adult Intelligent Scale (WAIS), the sample mean and variance on picture completion are X¯ = 9.79 and s = 2.72. Test the hypothesis H0: μ ≥ 10.5 with α = .025.
Why is a one-way ANOVA an appropriate statistical procedure for this scenario? Has the assumption of equal variances been met? Explain how you checked for this
What % of officers make more than 20 arrests per month? What % of officers make between 10 and 18 arrests per month? What number of arrests is the benchmark for officers who are in the top 10% of monthly arrests?
Redesign each study to eliminate any confounds that you find. Write a short paragraph for each case below, identifying the confound and indicating how you would eliminate it.
A sample of 1545 men and an independent sample of 1691 women were used to compare the amount of housework done by men and women in dual-earner marriages.
A sample of 121 provided a sample mean of 77.3. The population standard deviation is known to be 16.5. Compute the value of the test statistic.
a researcher believes that women today weigh less than in previous years. to investigate this belief she randomly
suppose n80000 n20000 and s50.a. compute the standard error of x using the finite population correction factor. round
The data in Table 8.11 were considered by Gentry and Pike (1970) in their study of the relationship between the mean rate of return over the period 1956 through 1969 and the 1969 value of common stock portfolios for 32 life insurance companies.
The standard deviation of a list of numbers is a measure of how much the numbers deviate from the averag
Twenty air samples were obtained and the carbon monoxide concentrations were recorded. the results in ppm (parts per million) were:
listed below are the durations in hours of a simple random sample of all flights of a space shuttle program. find
Determine the steady-state temperatures of two radiation shields placed in the evacuated space between two infinite planes at temperatures of 600 and 325 K. All the surfaces are diffuse and gray with emissivities of 0.7.
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