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Scatter plot, Correlation coefficient and Regression equation.
Do a complete regression analysis by performing the steps below.
Note: No regression should be done when r is not significant.
a. Draw a scatter plot.
b. Compute the correlation coefficient.
c. State the hypotheses.
d. Test the hypotheses at .
e. Determine the regression line equation (if applicable).
f. Plot the regression line on the scatter plot (if applicable).
g. Summarize the results.
The data below were obtained for the years 1993 through 1998 and indicate the number of fireworks (in millions) used and the related injuries. Predict the number of injuries (provided there is a significant relationship) if 100 million fireworks are used during a given year.
Based on your answers to a through d, decide whether or not to reject the null hypothesis at the given significance level. Explain your conclusion in the context of the problem.
Do 1-sample t-test to see if people in Chicago have travelled to fewer states than people nationwide. Utilize the 10% (.10) level of significance.
Determine the standard deviation of difference between Sarah's and Richard's scores?
Find the probability that an eligible voter selected at random will have the following characteristics.
Suppose that a researcher does a study to see how level of anxiety (A 1 = low, A 2 = medium, A 3 = high) is used to predict exam performance (Y).
If you have multiple regression output with 2 independent variables and R-Square is .9682, what does R-Square indicate?
What sample size would be needed to obtain an error of ±10 square millimeters with 99 percent confidence?
Compute the appropriate Test Statistic to test null hypothesis that mean of population is 4.3 against alternative hypothesis μ ≠ 4.3.
To determine if this is evidence that students perform worse under uncomfortable conditions, The P-value of a test
Compute mean absolute percentage error (MAPE) of the forecasts.
New study is to use 90% confidence level. Estimate is to be within 1 percent of population proportion. Determine the essential sample size?
Hours worked is important predictor of amount of sales.
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