## Statistics Resources

The following data are the monthly return y and the refund rate x for the retailer which sells electronic devices. The estimated regression equation for these data is đť‘¦Ě‚= 1587 + 650.3x. Refund...

A doctor wants to estimate the HDL cholesterol of all 20- to 29-year-old females. How many subjects are needed to estimate the HDL cholesterol within 3 points with 99 % confidence assuming sigma equals...

A random sample of fifty dash six 200-meter swims has a mean time of 3.71 minutes and the population standard deviation is 0.08 minutes. Construct a 90% confidence interval for the population mean...

A sample of 40 women is obtained, and their heights (in inches) and pulse rates (in beats per minute) are measured. The linear correlation coefficient is 0.299 and the equation of the regression line...

Tornadoes for January in Kansas average 3.2 per month. What's the probability that next January Kansas will experience exactly two tornadoes? A. 0.2087 B. 0.2226 C. 0.1304 D. 0.40...

A Food Marketing Institute found that 38% of households spend more than \$125 a week on groceries. Assume the population proportion is 0.38 and a simple random sample of 113 households is selected...

a. 1% b. 2.5% c. 5% d. 10%

A researcher would like to know if highlighting a textbook helps students to score better on the exams. She randomly selects one-half of the students in an introductory class and instructs...

A lightbulb manufacturer wanted to be sure that her bulbs burned, on average, longer than the 1,500 hours advertised. She selected a random sample of 56 bulbs and measured the time it took for...

What is the p-value associated with ? a. 0.0285 b. 0.0571 c. 0.1142 d. 0.9429

What is the p-value associated with ? a. 0.0285 b. 0.0571 c. 0.1142 d. 0.9429

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Seventy million pounds of trout are grown in the U.S. every year. Farm-raised trout contain an average of 32 grams of fat per pound, with a standard deviation of 7 grams of fat per pound. A random...