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The group has also stated that the estimate for the percentage of toys that are safe must be within .01 of the actual value. What should the sample size be to meet these requirements?
A researcher wants to make a 95% confidence interval for the population proportion. What is the most conservative estimate of the sample size that would limit the maximum error to within .03 of the
Say a random variable X is drawn uniformly from between 0 and 1. Say that Y = sin(2piX). What is the covariance between X and Y ? Are X and Y independent random variables?
How would you interpret the findings of a correlation study that reported a linear correlation coefficient of 0.3?
You chose 3 marbles without replacement from a bag containing 9 red, 12 blue, 5 yellow marbles. X is the number of blue marbles chosen.
Say a random variable X is drawn uniformly from between 0 and 1. Say that Y = sin(2piX). What is the covariance between X and Y? Are X and Y independent random variables?
The weekly incomes of shift foreman for a given industry follow a normal probability distribution. With a mean of $1,000 and a standard deviation of $100, what is the area under the curve between $
An airline has classified its customers as high-volume travelers (assumed to be business travelers) or low-volume travelers (assumed to be leisure travelers). Sixty-five (65) percent are high volume
Pick a collection of values (in reference to various variables) from a web site. Describe and list a few examples of your chosen collection. Pick a single data category/factor from your collection t
Irwin Textile Mills produces two types of cotton cloth-denim and corduroy. Corduroy is a heavier grade of cotton cloth and as such, requires 7.5 pounds of raw cotton per yard, whereas denim requires
Listed below is the amount of commissions earned last month for a sample of eight members of the sales staff at Best Electronics. Calculate the coefficient of skewness using both methods. Hint: Use
The probability that a car is red and has a white interior is 0.3. The probability that it is red is 0.7. The probability that a car is either red or has a white interior is 0.8. What is the probabi
Association: We know association does not imply causation, but what does this mean in your own words. Provide and discuss an example of two variables that are associated but not by a cause and effec
The IRS was interested in the number of individual tax forms prepared by small accounting firms. The IRS randomly sampled 47 public accounting firms with 10 or fewer employees in the Dallas-Fort Wor
In 1987, there were 342,970 cell phone subscribers in the United States. By 2008, the number of cell phone subscribers increased to 262,438,000. What is the geometric mean annual increase for the pe
A researcher wants to find out how college students feel about their social security system. Which of the following unbiased methods could the researcher use?
What is its MTTF before waranty? What is MTTF after the warranty period assuming it survived?
The ages for those who gamble online and in public are shown in the table. On the basis of the data provided, can you conclude that online gambling is more prevalent among individuals who are under
A new fuel injection system is experiencing failures. The reliability function is:
At a big store building with 100 elevators, the amount of waiting time for next elevator in seconds is a Gaussian random variable (30,5) X. Suppose the significance level is a = 0.01 and null hypoth
What is its MTTF before waranty and what is MTTF after the warranty period assuming it survived?
Derive the reliability function and determine the reliability for the first year of operation. Compute the MTTF. What is the design life for a reliability of 0.95?
Discuss the advantages of constructing a relative frequency distribution as opposed to a frequency distribution
Lisa is baking cookies for a bake sale. She has to make at least two different types of cookies. She has a choice of chocolate chip, oatmeal raisin, pinoly cookies and 7 layer cookies. How many diff
An administrator inconspicuously followed 260 students and carefully recorded their parking times. Identify the population of interest to the university administrator. The parking times of the entir