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If 200 of the adults surveyed were in the age category of 24 and under and they provided a standard deviation of $14.50, construct a 95% confidence interval for the weekly average expenditure on fas
Carry out a hypothesis test, at 5% significance level, to determine whether the president should retain Supplier A.
The Hawks are currently winning 0.55 of their games. There are 5 games in the next two weeks. What is the probability that they will win more games than they lose?
Question: Use the program Binomial Probabilities to find the probability that, in 100 tosses of a fair coin, the number of heads that turns up lies between 35 and 65, between 40 and 60, and between
If the spinner lands on on any space not chosen, the player loses the $2.00. (Assume that landing on a line is voided and spinner is respun) What is the expected value of the game?
Question: A particular firm carried out an extensive study into the costing of a specific type of project. it was found that the probability of completing such projects to budget is 0.2.
A bag contains 10 red, 12 green, and 8 yellow marbles. Assuming that all the marbles are equally likely to be picked from the bag, what is the probability that the second marble is yellow, given tha
Compute a 95% confidence interval for the population mean, based on the sample 1, 2, 3, 4, 5, 6, and 39. Change the number from 39 to 16 and recalculate the confidence interval. Using the results, d
Question: In order to determine an interval for the mean of a population with unknown standard deviation a sample of 61 items is selected. The mean of the sample is determined to be 23. The number o
Question: A population has a standard deviation of 50. A random sample of 100 items from this population is selected. The sample mean is determined to be 600. At 95% confidence, the margin of error
Two hundred students are enrolled in an Economics class. After the first examination, a random sample of 6 papers was selected. The grades were 65, 75, 89, 71, 70 and 80. Determine the standard erro
He neglected to report what confidence coefficient he had used. Based on the above information, determine the confidence coefficient that was used. Assume the population has a normal distribution.
The average monthly electric bill of a random sample of 256 residents of a city is $90 with a standard deviation of $24. Construct a 90% confidence interval for the mean monthly electric bills of all
Predict the average weekly sales of pet food for stores with 20 feet of shelf space for pet food. Compute coefficient of correlation. Compute standard error of estimate.
Change the number from 39 to 16 and recalculate the confidence interval. Using the results, describe the effect of an outlier or extreme value on the confidence interval.
In order to determine an interval for the mean of a population with unknown standard deviation a sample of 61 items is selected. The mean of the sample is determined to be 23. The number of degrees
A population has a standard deviation of 50. A random sample of 100 items from this population is selected. The sample mean is determined to be 600. At 95% confidence, the margin of error is:
As the number of degrees of freedom for a t distribution increases, the difference between the t distribution and the standard normal distribution
What assumption must be made before we can determine an interval for the mean grade of all the students in the class? Explain why.
Based on the above information, determine the confidence coefficient that was used. Assume the population has a normal distribution.
Many people who bought X-Game gaming systems over the holidays have complained that the systems they purchased were defective. In a sample of 1200 units sold, 18 units were defective. Determine a 9
Choo Choo Paper Company produces papers of various thickness. A random sample of 256 cuts had a mean thickness of 30.3 mils with a standard deviation of 4 mils. Develop a 95% confidence interval for
A random sample of 81 credit sales in a department store showed an average sale of $68.00. From past data, it is known that the standard deviation of the population is $27.00. Determine the standard
You are given the following information obtained from a sample of 5 observations taken from a population that has a normal distribution. Develop a 98% confidence interval estimate for the mean of the
Is it necessary to know anything about the shape of the distribution of the account balances in order to make an interval estimate of the mean of all the account balances? Explain.