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For recommendations on which laptop to purchase, consumers look at the ratings provided by Consumer Reports. A sample of 12 laptops was selected and the rating and score on the laptops' features were recorded as shown in the ‘laptops' file. The description of the variables in the ‘laptops' file is as follows: model (brand and description of laptop), price (retail price of laptop), rating (overall score by Consumer Reports), and features (a score of 1, 2, or 3 with low values indicating more features).
a) Find the prediction equation for the price of a laptop using rating and features. What is the value of the residual standard deviation?
b) If the value of SSE were equal to zero for this problem what would that imply?
The test statistic for a two-sided significance test for a population mean is z = -2.12. What is the corresponding P -value?
Determine the expected value and standard error of the sum of 400 draws?
Hypothesis test for the difference between two means - Assume the population standard deviations are not the same. At the 0.05 significance level, is there a difference in the mean waiting time?
Which test do we use to see if the difference in our sample is statistically significant? Why? Should it be one or two-tailed?
Assuming that all other variables are held constant, explain how the value of z influenced by each of the following:
What is the probability that at least three students choose Supreme Chocolate?
Of the adults in Jefferson County, 10 percent have had CPR training. For a randomly selected group of students from this county, how large will the group have to be in order for the probability that have as a minimum one group member has had CPR t..
Chi-square test for independent of attributes - A random sample of students is interviewed to determine if there is an association between class and attitude toward corporations?
Determine z score corresponding to minimum height requirement and determine z score corresponding to maximum height requirement.
Find out the marginal probability density function for the provided value. Assume that two random variables, X and Y, have bivariate pdf given by:
What is the probability the Time/CNN poll will provide a sample proportion within plus-or-minus 0.02 of the population proportion?
Which of the given properties doesn't apply to theoretical normal distribution?
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