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An upper-tailed two sample means test is to be conducted at .02 significance level. The populations standard deviations are unknown and can't be assumed equal. The degrees of freedom for the test st
To test the hypothesis that the normal population has mean 100, a random sample of size 10 is selected. If the sample mean is 110, will you reject the null hypothesis if the following is known?
Determine the probability that 20 plots chosen at random will have a mean fertilizer weight of 74.5 tons or more? Determine the probability that a single plot selected at random will have a load weigh
A sample of 20 cigarettes is tested to find out nicotine content and the average value observed was 1.2 mg. Assume that the population variance is not known in advance of the experiment.
How large a sample should you take to be 87% certain that the sample mean will be in 0.5 pounds of the population mean weight of hawks in the region?
A press employed to make machinery produces 4% defective parts. The parts are manufactured in lots of 130. Let pˆ be proportion of defective parts. Determine the mean and standard deviation of
A random sample of 36 bottles produced the sample mean of 48.15 ounces with the standard deviation of 0.3 ounces. Test the hypothesis at the 0.02 level of significance.
A bottle filling process has the setting of 48 ounces which is exactly what consumers want when they purchase the vegetable oil. A random sample of 36 bottles produced the sample mean of 48.15 ounc
A manufacturer of computer terminals claims its products will last at least 2000 hours without needing repairs. Data Incorporated is considering purchasing a great many of their computer terminals.
The sample results showed an average of 75 units per hour with a standard deviation of 5 units. The hourly output of workers without the new training was 73 units. What would be your conclusion at
An automatic machine is set to fill bags of dog food with the 25 pounds on average with the standard deviation of 0.5 pounds. A random sample of 100 bags was chosen. The sample mean was found to b
The average length of snakes is supposedly 25.5 inches. You take the simple random sample of 40 snakes and find out the mean length is 22 inches with the standard deviation of 2.1 inches and all of
Merit raises are given at discretion of the division director. The average raise at the ABC Company is $80 with the standard deviation of $30. The personnel manager is concerned that the certain d
The length of time between billing dates as well as checks received as well as deposited for non-delinquent accounts of oil company's monthly credit card customers is 13.5 days with the standard dev
You are trying to find out the percentage of hospitals that provide some free care. You know the distribution is mound shaped and symmetric. Based on a simple random sample of hospitals in seven maj
Ten percent of American adults are left-handed. A statistics class has 25 students in attendance. Would it be unusual to survey the class of 25 students and determine that 5 of them are left-handed?
Supposing that the population standard deviation for amount of time spent eating or drinking is 0.65 hour develop a 90% confidence interval for mean amount of time spent eating or drinking each day
Assume a test subject will lie 10% of the time. Determine the probability that the random statement by subject will be flagged as a lie by the machine?
Determine the probability that random sample of yarn has breaking strength that is in 1.5 standard deviations of mean? Assume five samples of yarn are chosen randomly. Determine the probability that
You're preparing for an exam in your American History course for which the professor has given out ten possible essay questions ahead of time. Four of them, randomly selected, will be on the exam.
A researcher hypothesized that variation in the car rental rates (in US$/day) at a major city airport is less than in the car rental rates down town.
Which of the following is most likely the cause of a level shift in a SPC chart?
Which is an appropriate step in continuous quality improvement?
Which nonparametric test is analogous to a parametric one-sample t-test for differences in paired data?
Which nonparametric test is used to compare a one sample median with a benchmark?