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The Greenland ice sheet covers roughly 80% of the surface of Greenland, being the second largest body of ice in the world, after the Antarctic ice sheet. As the arctic climate is rapidly warming, the Greenland ice sheet has experienced record melting in the recent years. The following data gives the depth of the ice sheet (in m) measured at various locations during the summer months in the Northeast greenland National Park: 3115, 3133, 3123, 3145, 3125, 3131, 3127, 3120, 3118, 3124 Using this data, is there enough evidence that the average depth of the ice sheet is below 3140 m? Assume that the depth of the ice sheet is normally dstributed. Use a test of hypotheses of level alpha = 0.05.
1. A company is evaluating the impact of a wellness program offered on-site as a means of reducing employee sick days. A total of 8 employees agree to participate in the evaluation which lasts 12 weeks.
List and describe the three assumptions of ANOVA. When should researchers use different hypothesis tests for independent and related samples? What is the difference between a one-way-ANOVA and a two-way-ANOVA?
For the normal distribution curve with mean of 19 and a standard deviation of 6, which range of the variable shows an area under the curve corresponding to a probability of approximately 99.7%?
The standard deviation of test scores on a certain achievement test is 10.5. A random sample of 150 scores on this test had a mean of 72.8.
Enter the data and use the appropriate commands to find the mean, median, mode, sample standard deviation, population standard deviation, 10% trimmed mean, and data count.
Determine the standard error of estimate. Suppose a large sample is selected (instead of just five). About 68 percent of the predictions would be between what two values?
Draw a histogram showing the 20 sample means. (Use classes -0.5 to 0.5, 0.5 to 1.5, 1.5 to 2.5 and so on). Describe the distribution of the x-bars that you see in part b (shape of distribution, center, and the amount of dispersion).
Ophelia O'Brien, VP of Consumer Credit of American First Banks (AFB), monitors the default rate on personal loans at the AFB member banks.
what is the required sample size is the error is to be less than 1/2 hour with a 95% level of confidence?
How many departments would they need to survey to achieve this level of accuracy with 95% confidence?
The standard deviation of 6. What is the probability that a class of 50 has an average midterm mark that is less than 75?
purpose students will conduct one brief research exercise that will be written up as a research report using apa
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