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If you are using the method of least squares for fitting trends in an annual time series containing 25 consecutive yearly values,
Write a problem which requries the reader to calculate standard scores (also called a z-scores) and use these to find percentages of the population whose data falls in a given rannge. Provide a copy
List some of the risks in using samples to make inferences about populations from which the samples were drawn. What can be done to mitigate these risks?
Aslin Finch would like to determine the effect of shelf space on the sales of pet food. A random sample of 15 stores is selected with the following results. Set alpha at .01.
Identify a journal article that used the Binomial Probability Distribution. In 100 words, summarize the study and its application of the Binomial Probability Distribution.
Construct a 95% confidence interval for the population mean, u. Assume the population has a normal distribution. A sample of 17 college students had a mean annual earnings of $3120 with a standard d
What is the definition of the odds ratio?
If the digits 0, 2, 4, 6 represent wins and the digits 1, 3, 5, 7 represent lose, then the random numbers 4657, 1323, 0236 represent what sequence of numbers of wins in three plays of the four games
You hear on the local news that for the city of Kalamazoo, the proportion of people who support President Obama is 0.53. However, you think it is less than 0.53. The hypotheses for this test are Nul
The average student loan debt for juniors for a recent year was $9540. Five years earlier the average student loan debt for juniors was $8880. Assume sample sizes of 34 were used and the population
Write out explicitly, using Bernoullis techniques, the formulas for the sums of the first n fourth, fifth, and tenth powers. Then show that the sum of the tenth powers of the first 1000 positive int
The length of a rectangle is increasing at the rate of 5 meters per minute while the width is decreasing at the rate of 3 meters per minute. At a certain instant, the length is 20 meters and the wid
If your ANOVA hypothesis test shows no interaction between two factors:
Perform the cross-classification of the two nominal variables into a contingency table. Test the hypothesis that there is no relationship between the two variables.
Use the Distribution Function method to find the c.d.f. and p.d.f. for Y_bar = (Y1+Y2)/2, the Average of the two lifetimes. Find the mean and variance of this average, using the answer in part (a).
You are playing a game which you flip 3 fair coins. It costs $2 to play the game, which must be subtracted from your winnings. Calculate the expected value for the game.
An election ballot asks voters to select 6 city commissioners from a group of 18 canidates. In how many ways can this be done?
Assume the distribution of the fat content is aproximately normal, what is the sampling distribution of the sample mean?
A company provides component parts for an engine. Parts specifications suggest that 95% of items meet specifications. The parts are shipped to customers in lots of 100. Let X be the number of defect
The owner of a local golf course wants to estimate the difference between the average ages of males and females that play on the golf course. He randomly samples 26 men and 22 women that play on his
The following partial minitab printout of a regression analysis where x is the length in centimeters and y is the weight in kg of American Black Bears. (Source: fieldtripearth.org)
According to a report by Scarborough Research, the average monthly household cellular phone bill is $73. Suppose local monthly household cell phone bills are normally distributed with a standard dev
The following data were collected for a test of linear correlation and Spearman's rank correlation was used:
Discuss how to perform a test of hypothesis to determine whether the variances of two populations are equal. Include a discussion of why the larger sample variance is placed in the numerator in the
The mean difference in total cholesterol levels (after - before) was 1.544 mg/dL with a standard deviation of 7.6237 mg/dL. Create a 99% confidence interval for the true average difference in choles