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A company studying the productivity of their employees on a new information system was interested in determining if the age (x) of data entry operators influenced the number of completed entries made per hour (y) the regression equation is y=14.374 - 0.145. if s = 14.04 and s(y) = 2.61 then the correlation coefficient between age and productivity is
Recent medical research demonstrated there is a strong (r=.60) correlation between the excessive weight and incidences of breast cancer. How can we interpret this statement?
find the 98 confidence interval for the difference between two means based on this information about two samples.
Determine the area under the normal curve with mu = 8 and sigma = 3. If Mary gets 90 on a physics test where mean is 85 and standard deviation is 4.59, where does she stand in relation to her classmates?
the cholesterol found in eggs is normally distributed with a mean of 200 mg. and a standard deviation of 8 mg. if a
List the 15 possible samples (without replacement) of two artists that can be selected from the six. for brevity, use the initial provided.
The sensitivity of a test is the probability that a person having the disease will test positive (indicating the person has the disease, i.e., it's the probability the test will pick up the fact that a person has the disease).
A coin was flipped 60 times and came up heads 38 times. (a) At the .10 level of significance, is the coin biased toward heads? Show your decision rule and calculations. (b) Calculate a p-value and interpret it.
Using the five steps of hypothesis testing and the 5% significance level (alpha), does showing the film change students' attitudes towards the chronically mentally ill?
Assume that you choose a 50 families sample. Which is the form expected from the distribution of the average or median of the sample?
People arrive at a restaurant at a rate of five per minute and wait to receive their order for an average of 5 mins. Customers eat in with a probability of 0.5 and carry out with a probability of 0.5.
find the number z such that 28 of all observations from a standard normal distribution are greater than
Given are five observations collected in a regretion study on two variables: What is the value of the standard error of the estimate?
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