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The following data represent the number of flash drives sold per day at a local computer shop and their prices.
Use ANOVA with a = 0.05 to determine whether there are significant differences between the treatments. Be sure to show your results in an ANOVA summary table.
Hospital Noise Levels. Noise Levels at different area urban hospitals were measured in decibels. The mean of noise levels in 84 corridors was 61.2 decibels, and standard deviation of the population
Find joint density and cumulative probability distributions of X and Y. Compute the probability that Alex and Yan both arrive in the first 10 min.
A plane arrives at the airport terminal six times late in one week. 50% of time the plane arrives early. Determine the probability the plane will be late the following week?
You are an accountant at the paper production plant and now believe your monthly costs have gone up. The costs have always been $400 but they seem to be greater now and you would like to test this c
You're an accountant at a paper production plant and now think your monthly costs have changed. The costs have always been $200 but they seem to be disimilar now and you would like to test this clai
You are a manager at the firm and you think your monthly costs have increased. The costs have always been $9,000 but you now thinkl they're more and would like to test this claim. If you run hypoth
Calculate the probability that Alex must wait for Yan for at least 5 minutes. Calculate the probability that their combined arrival time does not exceed 10 minutes
Females n=224, Mean= 2.42, SD= 1.35. Set up a 99% confidence interval for the difference between males and females in mean numbers of science subjects planned and interpret the meaning of this inter
You are a manager at a firm and you think your monthly costs have increased. The costs have always been $9,000 but you now think they are more and would like to test this claim. If you run hypothesi
The mean cost of hotel room in Washington DC is said to have always been $100 a night. You desire to run hypothesis test to see if there has been change in the hotel rate.
According to manufacturer of M&M candy, the color distribution for plain chocolate M&Ms is 13% brown, 13% red, 14% yellow, 24% blue, 20% orange, and 16% green. A Stat 200 student found a bag
Let X be the time (in minutes) between two successive purchases at a commercial website. We believe that X has an exponential distribution with parameter alpha = 0.2 purchases per minute.
Two such tasks are carried out independently with completion times X and Y. Describe the joint probability density function of X and Y? Determine the probability that the completion time for X would
In the random sample of 85 subjects, the sample mean is found to be x= 522.3. Also, the population standard deviation is o= 29. Find out the p-value for this test.
How would the values of this table be interpreted in terms of linear regression? If a "line of best fit" is placed among these points plotted on a coordinate system, would the slope of this line be p
Determine the kind of sample obtained by numbering each element in the population and then selecting every third or fifth or tenth, etc., number from the population to be included in the sample.
A medical researcher is interested in the whether patients' left arms or right arms are longer. If ten patients participate in this study, how many degrees of freedom must the researcher use when fi
At a certain university, average cost of books was $320 per student last semester and population standard deviation was $85. This semester sample of 55 students revealed average cost of books of $35
In a sample of 855 bartenders, 48.0% report hearing complaints from patrons about their jobs. If the margin of error for the proportion of bartenders hearing job complaints is 4.4 percentage points,
A college thinks that 22% of applicants to that school have parents who have remarried. How large the sample is required to determine the true proportion of students who have parents who have remarr
A magazine reported that 6% of American drivers admit to reading the newspaper while driving. If 500 drivers are selected at random, find the probability that exactly 40 will admit to reading the n
If a baseball player's batting average is 0.340 (i.e., the probability of getting a hit each time at bat is 0.340), find the probability that the player will have a bad season and get at most 60 hit
If the standard deviation of a normally distributed population is 60.0 and we take a sample of size 25, then the standard error of the mean is