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Define or give an example of a hypothetical construct. Explain why operational definitions are needed to define and to measure constructs.
The weights of the contents of cereal boxes are normally distributed, with a mean weight of 12 ounces and a standard deviation of 0.05 ounce. The weights of four cereal boxes selected at random are 12.01 ounces, 11.92 ounces, 12.12 ounces, and 11...
The summation sign is usually represented by:
The analysis of covariance (ANCOVA) is generally useful for _______________
He would like to estimate with .05 of the true proportion with a confidence level of 90%. What is the sample size needed?
What is the probability that between 5 and 10 firms, inclusively, purchase a Unix machine from Sun Microsystems?
Discuss why the standard error for the distribution of sample means is smaller than the standard deviation of sample scores. Distinguish between within-group designs and between-group designs.
The Aloha Banking Co. is studying ATM use in suburban Honolulu. A sample of 30 ATM's showed they were used the following number of times yesterday.
Change the frequencies to percentages - is there a group more likely to get high salaries.
Perform the indicated test of hypothesis. HO: M 7, given x= 0.01, N=25, Xbar = 7.019 and SD is =.1681. Assume the sample is selected from a normally distributed population.
For what proportion of patients will drug be effective for between 2 and 2.25 hours?
Calculate the Measures of Center and Measures of Variation for the following data set representing the chest size of 20 bears in inches.
The mean return for the random sample of 33 mutual funds is 14.93 percent with a standard deviation of 9.57. Test the null hypothesis: H0: mu = 15% at α = 0.05.
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