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Rumor has it going to class and reading a text book will improve your chances of doing well in your stats class. You notice that there are 4 students that always go to class and review the text book everyday. To determine if rumours are true, you ask those 4 students their marks on the quiz and find out thier marks are: 60,60,61,67. Based on these scores and the knowledge that the exam scores are normally distributed (hypothesized pop mean is 50 and standard deviation of 10)what can you conclude about going to class and reviewing the text book everyday? do you reject or fail to reject the null hypothesis? What is the effect size? assuming a=0.05, state your hypothesis for a one tailed test, the critical test statistic, your conclusion?
A letter is drawn 1,000 times, at random, from the word A R AB I A. There are two offers. (A) You win a dollar if the number of A's among the draws is10 or more above the expected number. (B) You win a dollar if the number of B's among the drawsis 10..
The error between the sample mean and the population mean for a sample of n = 16 is 5 points and the error between a sample men and population mean for a sample of n = 100 is 2 points. Explain the difference in the standard error??
Explain the purpose of the critical value in a hypothesis test, how do you find the critical value and what purpose does it play?
Suppose a reading between 30 and 40 is called very interesting from an archaeological point of view. Let us say you take readings at n=12 sites chosen at random.
Bicycle helmet use. Table lists data from a cross-sectional survey of bicycle safety. The explanatory variable is a measure of neighbourhood socioeconomic status (variable_RFM). The response variable is "percent of bicycle riders wearing a helmet"..
Could you please send me an example of a real-world situation or problem addressing the independent and dependent variables study; that includes a research question
Explain what the coefficient of determination, R^2 (R-squared), measures. How is it related to the sample correlation coefficient?
Generate a 95% confidence interval for the true mean total cholesterol levels in children.
A survey of 400 persons showed that 54.3% were in favor of product A. Test whether a majority were in favor of product A using a .05 significance level
Consider a hypothesis test that uses a 0.05 significance level to test the claim that the mean body tem of the population is less than 98.6
What is the difference between common cause variation and special cause variation? What should you do to improve a process when special causes of variation are present?
Evaluate a simple aggregate price index for 2004. Use 2000 as the base period - Estimating the simple aggregate price index.
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