Questions from Statistics

Q: a. What is the standard deviation for a data set of

a. What is the standard deviation for a data set of 50 values, all of which are the same? b. Which of the following two car batteries would you prefer to buy, and why? One taken from a population with...

Q: For each of the following situations, state whether the distribution of

For each of the following situations, state whether the distribution of values is likely to be a normal distribution. Give a brief explanation justifying your choice. a. Numbers resulting from spins o...

Q: Researchers created a form of genetically modified corn and compared it to

Researchers created a form of genetically modified corn and compared it to nonmodified corn, looking for differences in the substances released into the soil from the corn roots.

Q: Women have head circumferences that are normally distributed with a mean of

Women have head circumferences that are normally distributed with a mean of 22.65 inches and a standard deviation of 0.80 inch. a) Using the 68-95-99.7 rule, find the percentage of women with head cir...

Q: The graph in Figure 3.42 shows simultaneously the number of

The graph in Figure 3.42 shows simultaneously the number of births in the United States during two time periods: 1946–1964 and 1977–1994. When did the first baby bo...

Q: Assume that body temperatures of healthy adults are normally distributed with a

Assume that body temperatures of healthy adults are normally distributed with a mean of 98.20F and a standard deviation of 0.62F (based on data from University of Maryland researchers). a. If you have...

Q: One of Mendel’s famous genetics experiments yielded 580˜peas, with

One of Mendel’s famous genetics experiments yielded 580˜peas, with 428 of them green and 152 yellow. a. What single value is the best estimate of the population proportion of yellow peas? b. Use the s...

Q: We want to estimate the mean IQ score for the population of

We want to estimate the mean IQ score for the population of college students. We know that for people randomly selected from the general population, the standard deviation of IQ scores is 15. a. Using...

Q: A sample of 40 randomly selected women is obtained, and the

A sample of 40 randomly selected women is obtained, and the blood platelet count (in thousands of platelets per microliter of blood) of each subject is measured. The mean blood platelet count is 279.5...

Q: a. You have been hired by Intel to determine the proportion

a. You have been hired by Intel to determine the proportion of computer owners who plan to upgrade to a new operating system. Assuming that you want to be 95% confident that your sample proportion is...