Claim: The standard deviation of pulse rates of adult males is more than 12 BPM. For a random sample of 155 adult meals the pulse rates have a standard deviation of 12.8 BPM. Find the value of the test statistic

The mean act composite score of students is 22 with a standard deviation of 3.75. Assume the act scores of students are normally distributed. A friend of yours has an act composite score of 30. Determine your friends percentile rank and round two decimals

Assuming a population mean of 900 and a population standard deviation of 200 for LCSW scores. What percentage of individuals have LCSW scores greater than 1100? Plot answer on a normal distribution curve.

claim the standard deviation of pulse rates in adult women is at least 50. for a random sample of adult females the pulse rates have a standard deviation of 11.6.

The concentration of blood hemoglobin in middle-aged adult females is normally distributed with a mean of 13.5 g/dL and a standard deviation of 0.86 g/dL. Determine the hemoglobin levels corresponding to the: 90th percentile Middle 85% of middle-aged adult female hemoglobin levels

A fruit grower wants to test a new spray that a manufacturer claims will reduce the loss due to insect damage. She sprays 20 trees with the new spray and 20 trees with the standard spray.  The following data were recorded:   New Spray Standard Spray Mean yield per tree(lb) 240 227 Standard deviation 31.3 28.6   Do the data provide evidence that the new spray increases the yield per tree?

The average life span of one particular brand of refrigerator is 12 years with a standard deviation of 0.8. Find the percentage of the refigerators that last between 10 and 14.5 years. O 99.3% 99.9% 95.9% 97.8% ▶

The mean SAT verbal score is 485​, with a standard deviation of 97. Use the empirical rule to determine what percent of the scores lie between 485 and 679. ​(Assume the data set has a​ bell-shaped distribution.)

People's oxygen saturation  is normally distributed and has a mean measurement of 98.7 and a standard deviation of 1.2. Find the oxygen saturation for P35

Identifying individuals with a high risk of Alzheimer’s disease usually involves a long series of cognitive tests. However, researchers have developed a 7-Minute Screen, which is a quick and easy way to accomplish the same goal. The question is whether the 7-Minute Screen is as effective as the complete series of tests. To address this question, Ijuin et al. (2008) administered both tests to a group of patients and compared the results. The following data represent results similar to those obtained in the study:   Patient            7-Minute         Screen Cognitive Tests  A                            3                           11  B                            8                           19  C                          10                           22  D                            8                          20  E                            4                           14  F                            7                           13  G                           4…