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A researcher selects a sample of 80 people and records the frequency of participants choosing a low, moderate, or high calorie dessert in a buffet. What are the degrees of freedom for this chi-squar
A study was conducted with vegetarians to see whether the number of grams of protein each ate per day was related to diastolic blood pressure. The data are given below. What is the equation of the
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 .
The number of calories and the milligrams of cholesterol for a random sample of fast-food chicken sandwiches from seven restaurants are displayed. Is the correlation (using Pearson's r) significant?
As an incentive to get new customers, the local branch of a bank launched 'bouncing for bucks.' During this week long event, an customer opening a new checking account with the bank would have the o
The number of homes and centers for a selected sample of counties is shown. The data meets all the assumptions that are needed to carry out a parametric statistical procedure. What is the calculated
Based on a sample of 500 employment records, representatives from the United States Department of Labor find that 95% confidence interval for the proportion of females in the U.S. labor force is .35
Let X and Y be independent geometric distributions. U = min(X,Y), V = X - Y. Show that U and V are independent
A researcher wants to determine if there is a significant difference in the standard deviations of the number of weekly physician office visits between residents in rural and urban areas of the coun
Experiment; it would be easier to control for the effects of lurking variables such as exercise. Experiment; it would be unethical to subject people to a potentially harmful treatment over a long peri
If quality control inspectors wish to estimate the % cacao to within 1% of the true mean with 95% confidence, how many pieces of chocolate should they sample?
What is the number of trials (n), probability of successes (p) and probability of failures (q), respectively? Find the probability that she returns at least 2 of the 10 serves from her opponent. Find
There is sufficient evidence to support the claim that the sample proportion of fireflies is less than 12 in ten thousand. There is sufficient evidence to support the claim that the true population
How many elements are in the sample space of this experiment? What is the probability that the three numbers drawn are all multiples of 3?
Suppose that incoming calls per hour to a customer service center of a small credit union are uniformly distributed between 0 and 6 calls. What is the probability that at least 3 calls are received
Are any of these study times considered unusual in the sense of our textbook? Explain. Does this differ with your intuition? Explain.
Show all formulas and circle the appropriate answers. Show all six steps, use the p-value approach using the TI-83 or TI-84 calculator (except if chi-square test or correlation).
Show all calculations and circle the appropriate answers. Round only final calculations and do so to the correct decimal point. Use only the CLASSICAL APPROACH and show all SIX STEPS.
A large P-value indicates which of the following? the data do not support the alternative hypothesis
What percentage of the checkout times was at least 4 minutes? Calculate the mean of this frequency distribution. Calculate the standard deviation of this frequency distribution.
A certain segment of the sky contains Z starts. Each star is either a red giant with probability 1/3 or a white dwarf with probability 2/3, independently from the other stars.
Heights of men on a baseball team have a bell shaped distribution with a mean of 183 cm and a standard deviation of 5 cm. Using the Empirical rule, what is the approximate percentage of the men betw
The aim of this exercise is to show that -1<=p(X,Y)<=1 for any pair (X,Y) of random variables, where p(X,Y) is the correlation coefficient. Express f(t)=var(X+tY)=at^2+bt+c using the bilineari
What would the scatter plot show for data that produce a Pearson correlation of r = +0.88