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Suppose the probability of a customer purchasing 0, 1, 0r 2 books at a bookstore are 0.3, 0.2, and 0.5 respectively. What is the standard deviation of this customers book purchase?
Which of the following Pearson correlations shows the greatest strength or consistency of relationship?
Test the claim that the samples come from population with the same mean. A consumer magazine wants to compare the lifetimes ofballpoint pens of three different types. The magazine takes arandom samp
Charles savings and loan is testing the hypothesis that the portion of deposit slips which are filled out incorrectly is 1%. What is the null hypothesis?
Use a control chart to determine what signals, if any, indicate that the process is out of control. Then, list the days the signal occurred and the type of signal (I, II, or III).
Obtain the margin of err,r E, for the confidence interval you found in part (a). Determine the sample size required to have a margin of error of 0.7 cm with a 95% confidence level.
One characteristic of nonparametric tests is that they make few, if any, assumptions about the populations being investigated
Past experience has indicated that the actual diameter of the ball bearings is approximately normally distributed with a mean of 0.753 inch and a standard deviation of 0.004 inch. So we have that
It is known that 30% of all customers of a major credit card pay their bills in full before any interest charges are incurred. Suppose a simple random sample of 150 credit card holders is selected.
The round table of astrologists consists of 144 people. As they examine the laws of the stars, they find that it brings good luck to a Capricorn if a Scorpio sits on his/her right. Calculate the exp
As the sample size increases, the width of the interval increases. or As the sample size increases, the width of the interval decreases.
Compute sst, ssa, ssb and ssab. Set up an ANOVA table and test for any significant main effect and any interaction effect. Use a = .05.
Compute the 90%, 95% and 99% confidence intervals for the unknown population mean. Briefly discuss what happens to the width of the interval estimate as the confidence level increases. Why does this s
Show that if Z ? POI(6), then the random variables X and Y are independent and have Poisson distribution by calculating the joint p.m.f. of X and Y.
Suppose we have a floor made of parallel strips of wood, each with width 3, and we drop a needle of length 1 onto the floor. The aim of this exercise is to find the probability that the needle will
Let x and y be discrete variates with joint probability function f(x,y)=k(1/x+1/y) for x=1,2,3 y=2,3
He also noted the grade of exam they were taking (in the UK, musical instrument exams are known as ‘grades' and range from 1 to 8). He wanted to see whether the type of instrument played affec
Estimate the true percentage of acceptable fruit using a 99% confidence interval. (Hint: first find the number of acceptable fruit in the sample.)
In a certain town, 40% of the people work for the federal government. The table shows the probability distribution for the number of adults (among 4 randomly chosen) who work for the fede
A man pays $400 for a 1 year life insurance with coverage of $200,000.Given his age, he has a .995 chance of living for at least another year. What is the expected value of the policy? Should he buy
Scores on a statistics exam are given: 85 72 92 90 74 65 68 59 74 85 63 79 81 92 95 74 88 55. In preparation for conducting a significance testing using the data given in the previous question, plea
The average number of acres burned by forest and range fires in a large New Mexico County is 4,300 acres per year with a standard deviation of 750 acres. The distribution of the number of acres burn
A redundant constraint is eliminated from a linear programming model. What effect will this have on the optimal solution?
A researcher randomly selects a sample of participants from a population with a variance of 4. If the researcher selects a sample of 16 participants with a mean of 12, then what is the mean and stan
A professor finds that the average SAT score among all students attending his college is 1150±150 (?±?). He polls his class of 25 students and finds that the average SAT score is 1200.