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A nutritionist thinks the average person with an income below the poverty level gets less than the recommended daily allowance (RDA) of 800 mg of calcium.
Use a .05 significance level. Is this evidence that the average length of employment with the postal service has decreased from twenty years ago?
Increasing the alpha level from .01 to .05. Changing from a one-tailed test to a two-tailed test.
Identify a pair of variables for which you would expect to see a strong correlation but not a cause-and-effect relationship. Suggest an explanation for the association.
The East Coast researcher decides to construct a two-sided 99% confidence interval. Which researcher will have the more precise estimate? State your reason for choosing your answer. It may help to
A sample of n = 16 individuals is selected from a normal population with a mean of µ = 48 and a standard deviation of s = 12. After receiving a treatment, the sample mean is found to be M = 5
What is the advantage of reducing process variation, thereby causing process control limits to be at a greater number of standard deviations from the mean?
State your reason for choosing your answer. It may help to imagine that the sample standard deviation will be about the same for both samples.
Show the probability distribution for the time between interruptions. What is the probability a businessperson will have no interruptions during a 15-minute period?
Compare the mean for the heights of males and the mean for the heights of females in these data. Compare the values and explain what can be concluded based on the numbers. numbers being mean 67.27
If the alpha level is changed from a = .05 to a = .01, What happens to the boundaries for the critical region?
Develop a point estimate of the proportion of the BusinessWeek equity funds that are load funds. Develop a point estimate of the proportion of funds that are classified as high risk.
The weights of cans of soup produced by a company are normally distributed with a mean of 15g and a standard deviation of 0.5g.
What are the steps in the construction process?
X is a normally distributed random variable with a mean of 5.00. If the probability thatXis less than 6.32 is 0.67 (as shown below), then what is the standard deviation of X?
In a game, three regular, six-sided dice are thrown once. Find the probability of observing three different numbers. A player claims that you expect to see three different numbers on the dice in at
Which of the following would produce a standard error of 2 points? Explain your response.
Find the five number summary for this data set. Determine whether there are any outliers and sketch a box-plot showing clearly thresholds and outliers (if any).
What are the strengths and weakness of nonparametric tests? Can the outcomes of nonparametric tests be generailized.
Find the mean, variance and the coefficient of variation of this data set.
Heights of men on a baseball team have a bell shape distribution with a mean of 172cm and a standard deviation of 5cm. Using the emperical rule, what is the approximate percentage of mean between th
Why do you use the chi-square statistic? What type of data is used with chi-square analysis? what are the nonparametric tests that correspond to each type of parametic test in week one and week tw
Pulls two socks out of a drawer that contains two black, six brown, and two blue socks, all randomly arranged. What is the probability that the two he draws are a matched pair?
Suppose you interview 10 randomly selected workers and ask how many miles they commute to work. You'll compute the sample mean commute distance. Now imagine repeating the survey many, many times, ea
Explain the parts of a decision tree. What are some benefits of using decision trees?