Salaries of 32 college graduates who took a statistics course in college have a mean, x, of $62,000. Assuming a standard deviation, o, of $17,889, construct a 959 confidence interval for estimating the population mean u. Click here to view at distribution table. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. |

Cardiovascular Disease, Pulmonary Disease The duration of cigarette smoking has been linked to many diseases, including lung cancer and various forms of heart disease. Suppose we know that among men ages 30-34 who have ever smoked, the mean number of years they smoked is 12.7 with a standard deviation of 5.2 years. For women in this age group, the mean number of years they smoked is 9.4 with a standard deviation of 3.1. (Assume that number of years spent smoking can be measured exactly and no continuity correction is necessary. Round your answers to four decimal places.) USE SALT (a) Assuming that the duration of smoking is normally distributed, what proportion of men in this age group have smoked for more than 21 years? (b) Assuming that the duration of smoking is normally distributed, what proportion of women in this age group have smoked for more than 21 years? Need Help? Read It

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Use the normal distribution of SAT critical reading scores for which the mean is 504 and the standard deviation is 114. Assume the variable x is normally distributed. (a) What percent of the SAT verbal scores are less than 550? (b) If 1000 SAT verbal scores are randomly selected, about how many would you expect to be greater than 525? Click to view page 1 of the standard normal table. Click to view page 2 of the standard normal table. ww (a) Approximately % of the SAT verbal scores are less than 550. 745 (Round to two decimal places as needed.) 725229 Check answer ct:

Use Table A (Standard Normal Distribution) to find the proportion of observations that satisfies each of the following statements. In each case, shade the area under the curve that is the answer to the question.  The table chart below is the one that needs to be looked at  to find the proportion of observations that satisfies each of the following statements. The table chart along with the questions that needs to be correctly answered and shaded are below. This deals with Measures of Variations.