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Calculate the z-test for sample = 100, sample mean = 3.4, population mean = 3.67 and standard deviation of 0.7.
Salaries of 40 college graduates who took a statistics course in college have a mean of $62, 200. Assuming a standard deviation of $11,766 construct a 90% confidence interval for estimating the popu
Twelve different video games showing substance use were observed and the duration times of game play in seconds are listed below. The design of the study justifies the assumption taht the sample can
Construct a 90% confidence interval estimate of the propotion of deaths in the week before the holiday to the total deaths in the week before and the week after the holiday
After a suitable period of time, the reduction in blood pressure for each subject was recorded. A summary of these data is: Treatment n=21 xbar=23.48 s=8.01 Old Drug n=23 xbar=18.52 s=7.15 The resea
The sample mean and sample standard deviation of the breaking strengths of these welds were found to be 94 ksi and 3 ksi, respectively. Another sample of 60 welds using an alternative welding method
A random sample of 100 computer chips made by a manufacturer were inspected and 8 were found to be defective. Construct a 90% confidence interval for the true defective rate of chips made by this manu
In an inertia welding experiment, a sample of 50 welds were tested. The sample mean and sample standard deviation of the breaking strengths of these welds were found to be 94 ksi (thousand pounds pe
A bottling company is supposed to fill bottles with an average weight of 16 ounces. The company randomly selects several bottles and weighs the liquid. How large of a sample must be taken so that th
In a manufacturing process a random sample of 36 bolts manufactured has a mean length of 1.71 inches with a standard deviation of .08 inches. What is the 90% confidence interval for the true mean le
You work for an auto company. Each car produced is expected to have no more than4 defects (fit and finish tolerances outside of parameters).
The lottery game has participants choose 5 different numbers from 1 - 44. The winner is someone who has chosen the correct sequence. Find the probability of winning this lottery.
Construct the indicated confidence interval for the population mean µ using (A) a t-distribution. (B) if you had incorrectly used a normal distribution, which interval would be wider?
The degenerative disease osteoarthritis most frequently affects weight-bearing joints such as the knee. The following is a summary of data on stance duration (ms) for samples of both older and young
What is the null hypothesis? What is the research hypothesis? What are the degrees of freedom? What is the critical value? Do you reject or fail to reject the null hypothesis? What does this mean?
Assume that the ANOVA assumptions are verified. State the rejection rule to test whether the population mean differs using ?
A spice rack contains three jars of herbs and four jars of spices. If the jars are placed randomly on the rack, what is the probability that two herb jars are together?
The Journal of Research in Crime and Delinquency has published a study on the situational characteristics of crimes. In a random sample of 96 robberies, 36 were committed by people who acted alone.
A survey is taken in which 40 randomly selected respondents aged 25-40 are asked how many biological children they have. Consider the random variable X = number of children with the following possib
How many different ways can ten couples (MF) be seated in a row of twenty seats, such that the couples can be kept together?
In a random sample of four microwave ovens, the mean repair cost was $70.00 and the standard deviation was $11.00. Assume the variable is normally distributed use a t distribution to construct a 99%
Formulate a linear programming model that will allow the University of Iowa to conduct this experiment using a minimum cost blend of the two soil amendment mixtures. State clearly the Objective Func