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For the following data set, indicate whether the shape of the distribution is normal, positively skewed, or negatively skewed. Provide evidence for your answer by calculating the mean, mode, and median.
Hours spent watching TV in a week for a sample of children ages 1 to 6 (n=12)
5, 8, 4, 2, 15, 14, 10, 0, 5, 18, 4, 5
The level of glucose, x, in blood follows a normal distribution with mean = 13.8, and std dev = 2.6. What is the probability that in a healthy adult:
Using this information, calculate Beta risk (probability of Type II error) if the true population mean really is 77.
Test the hypotheses that the average household income in the township is greater than $100,000. Hint: Start by stating the null and alternative hypotheses.
Marks on statistics midterm test are normally distributed with mean of 78 and a standard deviation of 6. Determine the probability that class of 50 has average midterm mark that is less than 75?
The sample mean is 2.59 and the sample standard deviation is .66. Conduct the following test using 95% level of confidence.
Set-up/solve the problem graphically. (How many ceiling fans and how many floor fans should be made?)
What is the numerical value of the sample proportion p^ ? The P-value is the probability of what event?
Which test should we use to determine whether the difference between Mesa and Tempe is statistically significant? Why? Should it be one or two-tailed?
Compute a 3-month moving average forecast of demand for April through January (of the next year).
It is estimated that .44 percent of the callers to the customer service department of Dell Inc. Will receive a busy signal. What is the probability that of today's 1200 callers at least 5 will receive a busy signal? Use the poisson approximation t..
A random sample of 48 managers of large hotels has mean X‾= 5.91. The null hypothesis for the researcher's test is?
Using a level of significance of .05, is there evidence that the dual degree students are receiving lower grades? Explain.
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