2. What is meant by degrees of freedom? Find the values for each. la/2 and n = 18 for the 99% confidence interval for 1. W av a. the mean 3. b la/2 and n = 23 for the 95% confidence interval for la/2 and n = 15 for the 98% confidence interval for d. la/2 and n = 10 for the 90% confidence interval for e. la/2 and n = 20 for the 95% confidence interval for 3. la/2 the mean 9. C. the mean the mean %3D the mean 4. When should the t distribution be used to find a confidence interval for the mean? 10 For Exercises 5 through 20, assume that all variables are approximately normally distributed. 5. High Temperatures for May The predicted high temperatures for a day in late May for a random sample of U.S. cities are listed here. Estimate the mean population high temperature with 90% confidence. 60 73 103 67 88 86 89 76 79 72 88 87 6. Digital Camera Prices The prices (in dollars) for a particular model of digital camera with 6.0 megapixels and an optical 3X zoom lens are shown here for 10 randomly selected online retailers. Estimate the true mean price for this particular model with 95% confidence. 225 240 215 206 211 210 193 250 225 202 7. Women Representatives in State Legislature A state representative wishes to estimate the mean number of women representatives per state legislature. A random sample of 17 states is selected, and the number of women representatives is shown. Based on the sample, what is the point estimate of the mean? Find the 90% confidence interval of the mean population. (Note: e population mean is actually 31.72, or about 32.) Compare thia tho noint estimate and the confidence

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