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Transrail really wants this project and is considering a bid with only a 15% markup to $460,000 to ensure winning regardless of whether or not Rail Freight.
A probability of 0.70 and has failed with a probability of 0.30. What is the probability that fewer than 25 batteries will last at least 8 hours?
The company wants to determine if there are differences in salaries among male and female employees. Management took samples of male and female employees and their salaries.
Compute an independent-samples t-test on these data. Report the t-value and the p values. Were the results significant? Do the same thing you did for the t-test above.
Determine whether the average amount of time spent watching television per week has decreased. Formulate the null and alternative hypotheses for the study described.
A skeptical paranormal researcher claims that the proportion of Americans that have seen a UFO is less than 1 in every one thousand. State the null hypothesis and the alternative hypothesis for a t
Which of the following is it inappropriate to conclude from this research? That having children makes people more satisfied with their life.
This study involves 25 participants who are 65 years of age and older. Use the Kaplan-Meier approach to estimate the survival function.
Electricity consumed each month at a pharmaceutical chemical plan is believed to be related. Construct the ANOVA table of the regression to a significance level of 0.05, and explain the results.
A study is conducted to estimate survival in patients following kidney transplant. Use the life table approach to estimate the survival function.
At a .10 level of significance, use Stat Tools (or Excel) to test the sponsors' hypothesis. State the null and the alternative hypotheses and the decision rule. Finally, discuss your findings.
Construct a 95% confidence interval estimate of the population slope between selling price and assessed value. Compute and interpret the coefficients of partial determination.
A survey of employees at a company finds that 32 of the 88 employees. Find the test value for the difference in the proportion of employees who were ever late for work in the past year.
Use a .05 significance level to test claims that quarters manufactured with the new equipment have weights with a standard deviation less than .061.
A reporter from a news agency wants the statistical report translated into a simple sentence about the effect of the vaccine on autism. Provide that simple sentence.
A production manager wishes to determine if there is a difference in the number of production runs. Find a 90% confidence interval on the difference in the mean number of production units for the two
First National 1 = 4.1, σ1 = 1.2; City National 2 = 3.5, σ2 = 0.9. Use a 98% confidence interval to estimate the difference in the mean weekly deposits into IRAs for each bank.
Another sample was selected independently resulting in 2 = 22 with n2 = 100. The population standard deviation is σ2 = 7. Test that the population means differ using a 1% significance level.
Data are recorded on the effects of each drug. Is the research division using dependent or independent samples? Why?
A particular bulb is turned on once each evening for an average of 10 hr. If it is desired to have a reliability of 90 percent, what is its design life in days?
Find the probability that the student's score is less than 35. Find the probability that the student 's test score is more than 39.8. Find the probability that the student's test score is between 33
If the hypothesis test is preformed, how should you interpret a decision a)reject the null hypothesis and b) fail to reject the null hypothesis.
The female instructors at a large university recently lodged a complaint about the most recent round. What is the rate of promotion among female assistant professors?
What is the probability that a randomly selected North American adult watches television for more than 7 hours per day?
A student takes a pop quiz that consists of three true-false questions. Identify each sample space outcome using the C and I designations.