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We have collected the following variables out of a random sample.
A) What kind of model should be used to estimate final exam scores in terms of the other variables? Write down the mathematical model to estimate.
B) Now rewrite the model -- using c and s subscripts to indicate class and student respectively. Indicate using the subscripts which variables vary by class only and student only and by both class and student.
C) Suppose we estimate this model with OLS, and there is a correlation between unobserved student traits (in the error term) with attendance. How does this bias the coefficient of attendance?
At the .05 significance level, is the number of units produced on the afternoon shift larger?
Divide your data in half, your first 8 observations and your last 7 observations. Then use ANOVA to test to see if there is a significant difference between the two halves of your data. This list of Webpages that Perform Statistical Calculations h..
The alternative hypothesis is true. In this case the consumer advocacy group will have, A consumer advocacy group doubts this claim and tests the hypotheses
A year ago, Air Force implemented new test for finding which candidates are most probable to become successful pilots. Now they wish to see if implementing pilot predictor test was a good idea. Scores have been standardized to facilitate comparis..
Determine the average amount of time that a guest spends checking in. How would this change under each of the state options?
Table shows the smoking habits of group college students. If student is selected at random, determine the probability of getting someone who is man or a woman.
The mean and the standard deviation of a sample of 100 bank customer waiting times are 5.46 and 2.475 minutes, respectively. a) Assuming the distribution is bell-shaped, calculate the waiting time intervals containing 68% and 95% of bank customer w..
What is the real world value of the y-intercept and slope in a regression equation? Other than statistics problems, why should I care?
There is concern about the percent of on-time flights. A recent survey of two major airlines yielded the following results. At α = 0.05 test the claim that there is a difference in proportions of on-time flights.
What is the value of c for which there is 80% probability that a metal plate has a thickness with in the interval [4.3-c, 4.3+c]?
Do these data suggest a statistically significance difference between the proportions of drug-resistant cases in the two states? Use a 0.02 level of significance and computed value of 2.37.
Select a random variable to represent the category. Produce a probability mass function for that variable, and use it to compute the mean, the median and the variance of the data in the data set. Show the probability mass function, both in tabular..
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