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A sample has a mean of 118 and a standard deviation of 19.7. Find the value of x. (Give your answers correct to one decimal place.)
(a) Find the value of x that corresponds to each of these standard scores z = -1.85.
(b) Find the value of x that corresponds to each of these standard scores z = 1.53.
(c) Find the value of x that corresponds to each of these standard scores z = -0.84.
(d) Find the value of x that corresponds to each of these standard scores z = 0.8.
Final scores averaged 66 for the treatment group; the SD was 21. For the control group, the figures were 59 and 20. What do you conclude?
The NY Dept of Motor Vehicles (DMV) designs its license plates with space for 7 letters or numerals. In the most recent iteration, the DMV uses three letters followed by 4 numbers.
Would you use a one-tailed or two-tailed test? Explain your response.
At 95% confidence using the critical value approach, determine if the proportion of females in the company is significantly less than 50%.
At 95% level of confidence, can we conclude that the babies using the Gibbs product gained less weight?
Demonstrates clearly and fully the ability to use Excel to perform the correlation for the data set.
The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed,
Compute the value of the test statistic. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)
1) The mean of the twenty male IQ scores is 115. Test the hypothesis that the mean of female IQ scores is less than 115. Note: This test is not comparing the mean IQ of females to that of males, it is simply using 115 as a comparison value. In the..
The sample standard deviation of the first set of strengths was 8.2 ksi, the second set's S value was 9.8 ksi, and the S value for the 25 differences in strengths was 3.3 ksi.
A random sample of 7 students selected from a large class revealed the following scores: midterm 70, 62, 57, 68, 89, 63, 82 and on the final 80, 79, 87, 88, 85, 79, 91. Is there evidence of an improvement on the final?
Suppose also that after selecting 15 members at random we obtained the following paired observations: Use these data to find the covariance between age and the number of visits.
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