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A simple random sample of 50 speeds (in mph) is obtained from cars traveling on a section of I-10 through Tallahassee. The sample has a mean of 72.3 mph and a standard deviation of 7.4 mph. Use a 0.05 significance level to test the claim that the mean speed of all cars is greater than the posted speed limit of 70 mph.
Based on the above situation compute the value of the test statistic.
A random sample of 225 fathers from Littleton, yielded 97 who did not help with child care. Using a .05 level of significance test the claim that the proportion is at least 34%.
Draw the complete decision tree and determine whether the product should be launched or not.
Draw the suitable 2x2 table, compute and interpret suitable measure of association.
How many individuals will it need to sample to achieve this level of accuracy and confidence?
Suppose that 51% of the women who gave birth at a certain hospital last year were over 30 years old, and that 39% were unmarried.
Find the values of the correlation coefficient and the coefficient of determination. Find the slope, y-intercept, and equation of the regression line for the data. Plot the points and a graph of the regression line on the same axes.
Craft one page brief of the statistical results (include any additional pages needed for any APA tables or graphs and the SPSS syntax and output) in which you do the following:
Do you think the state has any intention of ever stopping the lottery, given the fact that the state relies on it to bring millions of dollars into its treasury?
Demand for a popular athletic shoe is nearly constant at 800 pairs per week for a regional division of a national retailer. The cost per pair is $54.
Assume that stock is currently selling for $100. The change in the stock's price throughout the nest year follows a normal random variable with a mean of $10 and a standard deviation of $20.
What is the probability that an improperly adjusted machine will produce five or more items before it is stopped? What is the average number of items an improperly adjusted machine will produce before being stopped?
They wish to conduct a survey of their students and find a simple random sample of 50 Freshmen, 40 Sophomores, 35 Juniors, and 30 Seniors.
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