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In a study of physical attractiveveness and mental disorders, 231 subjects were rated for attractiveness, and the resulting sample mean and standard deviation are 3.94 and 0.75, respectively.Constru
The American Resorts hotel chain provide an attitude test to job applicants and considers a multiple choice test question to be easy if at least 80% of the responses are correct.
Find out the sample size that is required to estimate the true proportion of blue-eyed community college students if you want your estimate to be within 0.02 with 90% confidence.
Perform an ANOVA tests. Include the ANOVA table and an explanation of the results. An article in the Journal of Agricultural Engineering Research (Vol. 52, 1992, pp. 53-76) described an experiment t
Perform an ANOVA test. Include the ANOVA table and an explanation of the results. An experiment was performed to determine the effect of four different chemicals on the strength of a fabric.
What occurs to the standard error of the estimate as the correlation moves closer to zero? Why?
The distribution of Student's t has The distribution of Student's t has
The U.S. Bureau of the Census in 1995 estimates that 25% of all American households are one-parent homes. A sociologist believes that the true percentage is much higher. In a random sample of 80 hou
The following linear trend equation was developed for the annual sales of the Jordan Manufacturing Company. = 500 + 60t (in $thousands). At what rate are sales increasing?
What is the long-term behavior of a variable over an extended period of time called?
In time series, economic periods of prosperity followed by recession are described as:
A sample of 500 students is chosen from a known population of 15000 students to develop a 99% confidence interval for the average SAT score. What correction factor should be used to compute the stan
The records of a department store show that 20% of its customers who make a purchase return the merchandise in order to exchange it. In the next six purchases, what is the probability that three cus
A sample of 100 is selected from a known population of 350 elements. The population standard deviation is 15. Using the finite correction factor, what is the standard error of the sample means?
The agency chooses 50 of these bottles, measures their contents, and obtains sample mean of 11.6 ounces with population standard deviation of 0.70. Use a 0.01 significance level to test the agency's
A random sample of 100 pumpkins is obtained and the mean circumference is found to be 40.5 cm. Assuming that the population standard deviation is known to be 1.6 cm use a 0.05 significance level to
A group of statistics students decided to conduct a survey at their university to estimate the average (mean) amount of time students spent studying per week. They sampled 554 students and found a m
Which of the following is not a characteristic of the F distribution?
Which is indicative of an inverse relationship between X and Y?
In a simple regression, which would suggest a relationship between X and Y?
Which isn't a characteristic of the Kruskal-Wallis test?
Twenty customers are randomly selected and each is given sample of Nut Butter ice cream to taste. The customers rank the taste of the ice cream on a 10-point scale.
Individuals in four different age groups are asked to rank, on scale of 1 to 10, three flavors of ice creams. Median rankings from the individuals are grouped by the flavor of ice cream and by age g
An agribusiness performed a regression of wheat yield (bushels per acre) using observations on 25 test plots with four predictors (rainfall, fertilizer, soil acidity, hours of sun). The standard err