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what does it mean for a sample to have a standard deviation of s=5? describe the scores in a such a sample.
now change the score of X=8, to x=18 and find the new mean and standard deviation
The mean and standard deviation for the new sample were then calculated to be M _ 6 and s _ 3. What are the values of the mean and standard deviation for the original sample?
use two sums from part a and the computational formal to compute sum of square (SS)for the scores.
Develop a table containing sales, lost sales, product, overtime production, and inventory at period completion for each period.
The students are given a Business Ethics test. At the .01 significance level, can she conclude that there is a difference between how well the different tutorials work for the students?
compute sum of square (SS), variance, and standard deviation for the sample.
The population variances are 4.5 and 5.0 respectively. Using a level of significance of .01, is there evidence that the first year female high school teachers are receiving lower salaries?
A student was asked to compute the mean and standard deviation for the following sample of n _ 5 scores: 81, 87, 89, 86, and 87. To simplify the arithmetic, the student first subtracted 80 points fr
Time spent using email per session is normally distributed, with u = 8 minutes and q = 2 minutes. What is the probability that the sample mean is between 7.8 and 8.2 minutes?
A newly married couple plans to have four children. Suppose that boys and girls are equally likely each time a child is born. What is the probability the couple will have no more than 2 boys?
Forecast the demand for pizzas for all weeks from June 23 to July 20. Use a three-week weighted moving average with weights of 0.2, 0.3, and 0.5.
If a sample of size n = 100 is randomly selected, find the probability that the sample mean will be between 150 and 157.
List at least 3 qualitative attributes of the snack food about which they might want to ask consumers. Make sure at least one of them is nominal.
At the 0.5 significance level. Test the claim that the proportion of fraudulent credit card applicants is more than 0.23. A sample of 1200 reveals that 26.3% of them are fraudulent
According to a survey reported in the Business Week, 30% of adults in the U.S. said that the cell phone is the invention that they hate most but cannot live without. If a random sample of 6 adults i
Use the 3-day weighted moving average method for forecasting days 4-7. Use Weight 1 day ago = 4, Weight 2 days ago = 3, and Weight 3 days ago = 2.
Does it appear the prevention plans were effective in reducing the mean amount of a claim? Use the 0.05 level of significance. Set up the Null and Alternate Hypothesis.
Find the predicted value of Y given X = 75. Give an interpretation of the predicted value in the context of the problem.
The mean height of a certain kind of plant is 185 centimeters. Suppose we want to carry out a hypothesis test to see if the mean height when these plants are treated with a certain chemical differs
Suppose we want to compare the observed and expected number of events among the group with <250 treatments. Perform inappropriate significant test and report two-tailed p - value.
Air-USA has a policy of booking as many as 22 persons on an airplane that can seat only 21. (Past studies have revealed that only 84% of the booked passengers actually arrive for the flight.) Find
Perform a significant test to assess whether there is an association between mortality from cirrhosis of the liver and duration of employment in the group hired after 1945. Report a p - value
A candy company distributes boxes of chocolates with a mixture of creams, toffees and cordials. Find the probability that in a given box, the cordials amount for more than half of the weight.
Supposed that total carbohydrate intake in 12 to 14 year old boys is normally distributed with mean 124g /1000cal and the standard deviation 20g/1000cal. What percentage of boys in this age range ha