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A machine is designed to produce ball bearings having a mean diameter of 0.574 centimeter with a standard deviation of 0.008 centimeter. To determine whether the machine is in proper working order, a sample of six ball bearings is taken every hour, and the mean diameter of each sample is recorded. (Note that each sample consists of six observations.) a. Design a decision rule using the mean diameter of the hourly samples so that you can be 95% confident that the machine is conforming to the required design standards for mean diameter of the manufactured ball bearings. b. The following table presents the mean diameter of the hourly samples for the day shift of one given day. Are there any conclusions that can be inferred from this data? Time of Sample Mean Diameter of Sample 1000 0.576 1100 - 1300 Machine down for retooling 1400 0.561
The Federal Government is stepping up efforts to reduce average response times of fire departments to fire calls. The distribution of mean response times to fire calls follows a normal distribution with a mean of 12.8 minutes and a standard deviat..
Suggest one psychological research question that could be answered by each of the following types of statistical tests:
Briefly explain how the standard deviation influences outcome of hypothesis test. How does σ influence measures of effect size?
What is the conditional probability that a student likes gospel music if we know that he or she likes country music and what is the conditional probability that a student who does not like country music likes gospel music?
Utilizing Excel data analysis calculate t distribution also deduce the result. Study of variance is used to investigate if there is a difference in the mean mileage of the three cars.
What is the event corresponding to the above system failing during one period of operation and what is the event corresponding to the above system functioning properly during one period of operation?
What statistic would be applied if the independant variable is nominal and one dependant variable is nominal and one dependant variable is scale? Is this a T-test?
There are 8 members on the board of directors. If the board must form a committee of 6 members, how many different ways may the committee be selected from among the 8 board members?
The medical school at a university, if 10 medical students are randomly selected for that school. find the probability that only 4 of them will graduate.
Rob earns $50,000 per year. The mean salary for engineers with less than 5 years experience is $60,000 with a standard deviation of $5000. What is the Z value of Rob?
Shopper Trak is a hidden electric eye designed to count the number of shoppers entering a store. When two shoppers enter the store together one walking in front of the other, the following possibilities apply.
First k is repeated (possibly by using some of the first k flips). Show that the expected number of additional flips after the initial k is 2^k?
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