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When using the weighted moving average forcasting method, the sum of all the weights used must add to what number?
The FDA tests the tobaccos in two different types of cigars for nicotine content (in mg) and obtained following results. Construct the 95% confidence interval for the difference between mean nicotin
In an experiment to study the effect of a particular drug on the number of errors in the maze-learning behavior of rats, the following MINTAB results were obtained for a 2 sample unequal variance t-
A market research survey is available for no cost. Using a decision tree analysis, it is found that the expected value with the survey is $65,000. The expected value with no survey is $62,000 and th
A study was conducted to determine whether persons in suburban district II have a lower mean income than those in district I. Random samples were taken in each district with the following results (i
The sum of the ranks for the day students was determined to be 184.5. Compute the test statistic Z. Use a = 0.05 and test to determine if there is a significant difference in the populations of the sc
Information about a regression analysis includes an intercept of 59.99 and a negative slope of 1.49. Make a prediction of y based on an x value of 20.
An apprentice's decision making philosophy is to always be very optimistic with company funds as promotions for an apprentice only occur if they take risks. Given that he has no probabilities to dir
The mean balance that college students owe on their credit cards is $896 with a standard deviation of $104. If all possible random samples of size 169 are taken from this population, determine: The
In a particular occupation, a random sample of 210 men found that 65 smoked. In a random sample of 240 women, 87 smoke. Is there enough evidence to conclude males and females in this occupation have
What is the probability of Type I error? (Round your answer to 4 decimal places.) What is the probability of Type II error? (Round your answer to 3 decimal places.)
In random samples of 900 men and 400 women it is found the 99 men and 36 women suffer from kidney stones. Is there statistical evidence that the proportion of male kidney stone sufferers is greater
In a random sample of 400 Minnesota residents 330 have home internet access whereas in a random sample of 900 Wisconsin residents 820 have internet access at home. Find the 98% confident interval fo
A machine produces marbles of 3 different colors, aqua, black, and canary with the corresponding probabilities: PA , PB , PC . Get n marbles from this machine. Find the probability of each event.
Checkout scanners - Proportion problem. The Federal Trade Commission (FTC) conducted a study in 1998 of checkout scanners. The FTC inspected 1,669 scanners at retail stores and supermarkets by scann
The population of a town grows at a rate proportional to the population present at time t. The initial population of 500 increases by 25% in 10 years. What will be the population in 30 years?
Let X be uniform on [0,1] and Y be uniform on [-1,1]. Consider the random variable Z=X+Y. a. Using convolution, find and carefully plot fz(z) b. Plot Fz(z)
The internal auditing staff of a local manufacturing company performs a sample audit each quarter to estimate the proportion of accounts that are delinquent more than 90 days overdue
The yearly cost of dental claims for the employees of the local shoe manufacturing company is normally distributed with a mean of $105 and a standard deviation of $35. What is the yearly cost at whi
Is the average number of television watched per evening in Australia less than in Britain? (Null and Alternative Hypothesis required). Is a one or two sided hypothesis test required?
Write a null and alternative hypothesis for the following research question: Is the amount of time Australian children watch television per night less than 196 minutes? (Null and Alternative Hypoth
Twenty percent of the employees of a large company are female. Use the normal approximation of the binomial probabilities to answer the following questions. What is the probability that in a random
The length of time it takes for Gandolf's fireworks to explode after they are launched is presumed to be uniformly distributed. If the length of time it takes them to explode occurs over the interva
Give examples of two variables that are positively correlated and two that are negatively correlated. What statistical test is used to test the significance of the correlation coefficient?