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1. A national public television network has found that 35% of its contributions are for less than $20, with 45% for $20-$50, and 20% for more than $50. In a random sample of 200 of the contributions to a local station, 42% were for less than $20, 43% were for $20-$50, and 15% were over $50. At the 0.05 level, does the local station's distribution of contributions differ significantly from that experienced nationally?
2. Twenty-five percent of the employees of a large firm have been with the firm less than 10 years, 40% have been with the firm for 10 to 20 years, and 35% have been with the firm for more than 20 years. Management claims to have randomly selected 20 employees to participate in a drawing for a new car. Of the 20 employees chosen, 3 have fewer than 10 years with the firm, 5 have been there between 10 and 20 years, and 12 have been with the firm for over 20 years. At the 0.025 level of significance, evalu- ate management's claim of random selection. Using the chi-square table in Appendix A, what is the most accu- rate statement that can be made about the exactp-value for the test?
assuming that the heights of college women are normally distributed with men 65 inches and standard deviation 2.5
a pharmaceutical company wants to test the effectiveness of their new chronic pain drug. they give one group of 35
kilgallen inc. has the total inventory of 1000. currently kilgallen has this entire inventory stored in one warehouse.
what is the correlation between leadership trustworthiness and ethical stewardship? support your
A survey is being planned to estimate, with a 98% confidence interval, the mean amount of time per week that seniors spend watching television. The population standard deviation is known to be 5.2 hours. What sample size will be required to obtain..
A sample of 36 packages reveals the mean weight to be 3.01 pounds, with a standard deviation of 0.03 pounds. What is the estimated population mean?
A local bank wants to install motion detector burglar alarms. Each has a 70% chance of detecting a burglar. If the bank wants to be 99% certain of detecting a burglar how many need to be installed?
Of the drivers who stop at a gas station, 92% purchase gasoline, and 6% purchase both gasoline and oil. A total of 7% purchase oil.
Calculate the exact probability of arrangement occurring by chance assuming that males and females are equally likely to be promoted.
Formulate the null and alternative hypotheses. State the level of significance. Find the critical value (or values), and clearly show the rejection and nonrejection regions. Compute the test statistic
Use the mean, median, and mode to make a statement about the difference in performance for city and highway driving.
At the .05 significance level, is the number of units produced on the afternoon shift larger?
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