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A survey was conducted of the age? (in years) of 30 randomly selected customers. The mean was 32.78 years and the standard deviation was 11.17 years.
?a) How large would the sample size have to be to cut the margin of error in? half?
?b) About how large would the sample size have to be to cut the margin of error by a factor of 5??
A social worker is interested in estimating the average length of time spent outside of prison for first offenders who later commit a second crime and are sent to prison again.
Discuss which analysis of variance should be applied when an experiment has more than one independent variable. Discuss the assumptions and limitations of the analysis of variance in comparison with the t test including a discussion of post hoc te..
In an effort to control costs associated inventory management, a study was conducted on the relationship between sales (X, in billions of US dollars) and inventory levels (Y, in billions of US dollars), with a random sample of size 20. You are ass..
Watch one or more of the following videos discussing randomness, statistics, and the science of prediction, and then submit a brief (1/2 to 1-page) summary. Upload the file indoc, docx, or pdf format (if pdf, make sure you saved it or exported it..
Assuming that the decision makers in this situation are not willing to make the assumptions required to perform the paired-sample t-test.
Produce a relative frequency histogram for this data. Does it seem plausible the data come from a population that has an exponential distribution?
Determine the mean and standard deviation for x = the amount paid by individual visitors.- Determine the mean and the standard deviation for the sampling distribution of for samples consisting of 3 visitors each.
Write the four parts for a one-sided, right-tailed hypothesis test concerning the population mean with a = 0.01.- What assumptions are made in order for the test in part (a) to be appropriate?
question the ziteck corporation buys parts from international suppliers. one part is currently being purchased from a
What is the area between a raw score of 113 and 126 in a normal distribution with a mean of 100 and a standard deviation of 100?
A class has 2n (a large number) students The students are separated into two groups A and B each with n students. Group A students take exam A and earn iid scores X1,..., Xn. Group B students take exam B, earning iid scores Y1,..., Yn.
Briefly describe how the standard deviation influences the outcome of the hypothesis test. How does standard deviation influence measures of effect size?
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