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Annual starting salaries for college graduates with business administration degrees are believed to have a standard deviation of approximately $2,000. Assume that a 95% confidence interval estimate of the new annual starting salary is desired. How large a sample should be taken if we do not want to exceed $500? What do you know?
If the correlation coefficient expresses the degree of a linear relationship, why is it appropriate to use the same formula with nonlinear relationships?
In a test of the MicroSort method of gender selection, 51 babies are born to couples trying to have baby boys, and 39 of those babies are boys (based on data from the Genetics & IVF Institute).
At the 5% level of significance test whether the bottling process is carried out accurately or whether the filling machinery needs calibration. Use both the critical and the p-value approaches.
It is believed that population standard deviation is 15 days. If test is conducted using a 0.05 level of significance, what conclusion must be reached?
X is a random variable that represents ph of arterial plasma, the mean of the x distribution is 7.4. a random sample of 31 patients with arthritis took the drug for 3 months blood test
Telephone calls arrive at a switchboard in a Poisson process at the rate of 2 per minute. A random one-tenth of the calls are long distance.
One of 4 bus drivers is also arbitarily selected. Let Y denote number of students on his bus. Caculate expectations of X and Y: E(X)=?
A work-study engineer times a certain operation, and discovers that the average time it takes is 10 minutes, but on 15% of occasions it takes more than 13 minutes.
Determine which is the dependent variable Y and which is the independent variable X. Explain your reasoning. Draw a scatterplot and indicate the relationship if any. Explain. Compute the least-squares regression equation. Show major line items of you..
There are many nonparametric tests that have been developed over the years. Explain what nonparametric tests are and why they were developed.
The amounts dispensed by a cola machine follow the normal distribution with a mean of 7 ounces and a standard deviation of 0.10 ounces per cup.
Explain the double-negative logic of hypothesis testing (eg: a scientist fails to reject the null hypothesis). What is the five-step process for hypothesis testing? Is the order important? Why or why not?
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