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A professor used data from last semester's statistics class to create a regression that predicts how students will do on the final exam. The equation is yˆ = 70.2 + 3.2 (X1) - 6(X2), where X1
A hospital administrator counted the number of nurses by gender in three different nursing specialties within her health system. Perform the appropriate hypothesis test to answer this question (at
Randomly pick up 5 cards from a deck of 52 cards. Find the probability that the third card is red if the first card is ace and the fourth car is red.
a) Create a scatterplot for these data. b) Calculate the correlation coefficient.
One of your company's products, a flux capacitor, is known to have an exponential failure time distribution with a mean of 5 years. What is the reliability at 6 years?
The following data are from an independent-measures experiment comparing two treatment conditions. Do these data indicate a significant difference between the treatments at the .05 level of signif
One sample has n = 8 and SS = 21 and a second sample has n = 8 and SS = 35. What is the pooled variance for the two samples?
What is the estimated standard error for the independent-measures t statistic for the following two samples? Sample 1: n = 4 with SS = 100.
Given that 10% if all people are left-handed, what is the mean and variance for this random variable?
Given that f(z) = (1/√(2π))*e^(-z2/2), -∞ < z < ∞ , is the probability density function for the standard normal random variable, verify that the mean for the distributi
If the random Q has a continuous uniform distribution with parameters a=0 and b=3, find the probability that the roots of the equation g(t) = 0 are real, where g(t)=4t^2+4Qt+Q+2.
A sample of 12 clock radios is randomly selected without replacement from the 8,000 and tested. The entire batch will be rejected if at least one of those tested is defective. What is the probabi
What hypothesis test would be used to analyze these data? Justify your answer. Conduct the six steps of hypothesis testing for this example, using the above data.
Find the standard error of estimate, se, for the data below, given the predicted value of y = -0.206x + 2.097.
Use this calculation table for the chi-square test for goodness-of-fit to complete this exercise.
Question: For each of the following, identify the independent variable(s), dependent variable(s), and the level of measurement (nominal, ordinal, scale).
Determine the named distribution that would best used to find situations and explanation why. A person draws 5 cards, without replacement, from a normal deck of cards and counts the number of hearts.
For the chi-square hypothesis tests, however, the degrees of freedom are based on the numbers of categories, or cells, in which participants can be counted.
Assuming that the data are normally distributed with a mean of 25 and a standard deviation of 1.25, what is the z-score for a value of 27?
What are the hypotheses when conducting the chi-square test for goodness-of-fit?
The lengths of pregnancies of humans are normally distributed with a mean of 268 days and a standard deviation of 15 days. A baby is premature if it is born three weeks early.
The chi-square test for goodness-of-fit is a nonparametric hypothesis test used with one nominal variable. The chi-square test for independence is a nonparametric test used with two nominal variable
In a survey of 2480 golfers, 15% said they were left-handed. The survey's margin of error was 3%. Construct a confidence interval for the proportion of left-handed golfers.
A sample of 3 items is selected at random from a box containing twenty items of which 4 are defective. The expected value of defective items E[X] in the sample is 3/5. The question is what is E[X2]
Suppose it is known that 10% of people who play poker machines have a gambling problem. Suppose it is also known that 20% of the population play poker machines and 5% of the population have a gambli