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A personal computer manufacturer is interested in comparing assembly times for two keyboard assembly processes
It is believed that more than 50% of recovering alcoholics exhibit high levels of depression.
In research we often rely on the 68-95-99.7 rule. Discuss how this can be applied to make statements about the number of data values below 1, 2, or 3
A comparison between products manufactured in China VS Mexico and their perceived quality to the US consumer based on manufacturing location
A consumer products testing group is evaluating two competing brands of tires, Brand 1 and Brand 2.
For the following statement, write the null hypothesis and the alternative hypothesis. Then, label the one that is the claim being made.
Define what a hypothesis is and discuss the relationship between hypothesis testing and statistics.
A bus company claims that the mean waiting time for a bus during rush hour in less than 7 minutes. A random sample of 20 waiting times has a mean
A manufacturer receives an order for light bulbs. The order requires the bulbs have a mean life span of 750 hours.
The engineering school at a major university claims that 20% of its graduates are women. In graduating class of 210 students, 58 were women
A trucking firm suspects that the mean lifetime of a certain tire it uses is less than 35000 miles.
Create a 2 graphs made by excel showing comparison of mean between the control and unibrow group. and the other needs to show the rejection region.
The contingency table below shows the results of a random sample of 200 state representatives that was conducted to see whether their opinions on a bill
A medical researcher suspects that the pulse rate of smokers is higher than the pulse of non smokers. Use the sample statistics below to test the researchers
Assume that the data has a normal distribution and the number of observations is greater than fifty. Find the critical z value used to test the null hypothesis.
The Federal Government recently granted funds for a special program designed to reduce crime in high-crime areas.
The cost of an e-commerce website can vary a great deal. A market research team hypothesized that the cost of an average website is $3500.
A sociologists wanted to determine which academic subject high school students preferred. The hypotheses she wishes to test are:
A supermarket advertises that the waiting time spend by customers waiting in line at the cash register is uniform between 0 and 6 minutes.
There are two boxes, Box A and Box B. Box A has 40 tags with the number 1, 50 tags with the number 10, and 10 tags with the number 100.
At the time she was hired as a server at the restaurant, Beth was told, "You can average more than $20 a day in tips."
Calculate and interpret the appropriate statistical test to determine the relationship between the following two variables
A random sample of 36 college students revealed that the mean number of videos watched last month was 6.2, with a standard deviation of 0.5
The mean length of stay of employees for a company in a particular dangerous industry is 16.7 months
A sample of 120 observations revealed that p = .30. At the 0.05 significance level, can the null hypothesis be rejected?