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A doctor believes that the variance of systolic blood pressure is 470. A random sample of 20 patients found a variance of 525. What is the smaller critical value that would be used in a hypothesis test at a .05 significance level?
Derive the standard error of proportion, the margin error and the 95% confidence interval for the proportion indicating preference to flirting.
The alternative hypothesis is true. In this case the consumer advocacy group will have, A consumer advocacy group doubts this claim and tests the hypotheses
Determine the confidence interval for population mean and the Superintendent wants to determine the average amount of hours per week the student population studies at home.
In the real world, a given null hypothesis is false; but the collected data lead to the null hypothesis being accepted. That is, the data lead to a failure to reject the null hypothesis.
In the history class the mean score was 76 with standard deviation 3.
The regression equation is Y = 29.29 - 0.96X, the sample size is 8, and the standard error of the slope is 0.22. What is the critical value to test the significance of the slope at the 0.01 significance level?
Consider the following time plot of the values of variable Y for each month of a 60-month period. This plot displays
Assume that the weights of coconuts are normally distributed with a mean weight of 17.6 pounds and a standard deviation of 1.2 pounds.
Based on this information, by what factor does the risk of having an accident increase due to driving while intoxicated?
Computing the mean, standard deviation values for the given data - Describe how statistics is being misused in this situation
CASE STUDY: Are the Fish Safe to Eat? Assessing which Factors affect Mercury Levels in Fish in Maine Lakes.
Calculate the z - scores for the three samples, compare the z score to the t-statistic, is the null hypothesis accepted or rejected?
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