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A random sample of 81 credit sales in a department store showed an average sale of $68.00. Historically, it is known that the standard deviation of the population is $27.00. a) determine the standard error of the mean, b) with a 0.95 probability, what can be said about the margin of error and c) what is the 95% confidence interval of the population mean?
Scatter plot, Correlation coefficient and Regression equation - Do a complete regression analysis by performing the steps below
Assume that the significance level is a= 0.1. Use the given information to find the p-value and the critical value (s). With H1: p = with line through it 1/2 the test statistic is z= - 1.35
You find that a random sample of five microwave ovens has a mean repair cost of $75 and a standard deviation of $12.50. At α = 0.01, do you have enough evidence to support the repairer's claim?
This model is fit to the data using the method of least squares using statistical software, and the following ANOVA table is obtained
Compute the two groups using Paired sample t-test. Compute which modification reduced the number of traffic accidents
What will be critical value of chi-square if test is to be performed at 0.025 level? At the 0.05 level?
The mean of a standard normal probability distribution.
Assume that in a hypothesis test with null hypothesis H 0 : μ = 14.0 at a = 0.05, that a value of 13.0 for the sample mean results in the null hypothesis not being rejected. That corresponds to a confidence interval result of:
Determine the critical value, z0, to test the claim about the population proportion p
A survey taken in a restaurant shows the following number of cups of coffee consumed with each meal. Construct an ungrouped frequency distribution.
Why is population shape of concern when estimating a mean? What does sample size have to do with it?
Using the sample information given in the above exercise, the p value for testing Ho versus Ha can be calculated to be 0.0057
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