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Problem: Assume that weekly screen time follows a normal distribution with a std for 5 hours. During a survey, 125 people were asked about the number of hours they watched the screen during the last week the average answer was 21 hours
Required:
Question 1: Based on this survey construct a 95% confidence interval for the weekly number of screen hours
Question 2: What should be the sample size that will ensure that the margin of error will not be higher than 0.5 for a confidence interval of 95%
When one of the five predictor variables in the preceding example is elimi- nated from the analysis, the value of R2 drops from 0.75 to 0.71. What does this tell us about the variable that was dropped?
Starting in the 10th century, movements to reform the church began. Why was the church in need of reform, and what were the consequences of the Gregorian Reforms?
what proportion of the data from a normal distribution is two standard deviations from the mean?1. 0.47722. 0.34133.
Explain the difference between linear and nonlinear relationships between two variables. Explain the difference between a simple and a multiple regression model
For example, FFD means the first two are foreign-born and the third is not. All eight arrangements are not equally likely. What is the probability of each one?
Suppose we play a game where we start with c dollars. On each play of the game you either double or halve your money, with equal probability. What is your expected fortune after n trials?
Let X be the number of key terms appearing on the exam that he has studied. What is the distribution of X? Give the name and parameters, in terms of s.
State the null and alternative hypotheses in terms of p.- Describe a type I error and a type II error in this context.
A linear regression model has a slope of â?"2.5 and an intercept of 10. The sample coefficient of determination is 0.50. What is the value of the sample correlation coefficient?
Why the simultaneous targeting of the money supply and interest rates is sometimes impossible to achieve?
Compare the old schedule that includes overtime on weekends for the regular workers to the new schedule. How much is the company saving?
The choice of sampling design has no effect on the choice of the procedure used for statistical analysis.
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