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Multiple choice questions based on multiple regression.
1. A multiple regression model has the form = 5 + 6X + 7W. As X increases by 1 unit (holding W constant), Y is expected to
1. increase by 11 units 2. decrease by 11 units 3. increase by 6 units 4. decrease by 6 units
2. In a regression model involving 44 observations, the following estimated regression equation was obtained. = 29 + 18X1 + 43X2 + 87X3. For this model SSR = 600 and SSE = 400. The coefficient of determination for the above model is
1. 0.667 2. 0.600 3. 0.336 4. 0.400
Compute the value of t. What is your decision regarding the null hypothesis?
Be certain to mention the direction of the relationship, the strength of the relationship, and whether our findings are statistically significant
The following study was developed by Economist Simon Fass. Fass surveyed a sample population of low-income households in St. Martin. The variables analyzed were monthly income per adult and choice of rental contract for housing.
What is the appropriate conclusion based on the outcome of the hypothesis test?
A state survey investigates either the proportion of 8percent for employees who commute by car to work is higher than it was five years ago.
At 5 % level of significance, does this sample prove violation of the guideline that average patient muts pay no more than $250 out-of-pocket? Is this a close decision?
By using a level of significance of .10, is there evidence that the population mean weight of the candy bars is greater than 4.3?
What is the probability that the mean annual precipitation during 49 randomly picked years will be less than 101.8 inches?
Assume that p-value was 0.07, would you reject null hypothesis of equal mean rates for a Type- I error rate of 5%? (Circle one).
The margin of error for a 95% confidence interval estimate for the proportion of all students with cell phones is
The random variable x is known to be uniformly distributed between 70 and 90. The probability of x having a value between 80 to 95 is
How much evidence is there that the mean composite satisfaction rating exceeds 42?
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