Questions from Statistics

Q: A U.S. adult who is at least 20 years

A U.S. adult who is at least 20 years old is selected at random. What is the probability that the person’s triglyceride level is between 100 and 150? Use technology to find the probability.

Q: 1. Find the z-score that has 96.16

1. Find the z-score that has 96.16% of the distribution’s area to its right. 2. Find the positive z-score for which 95% of the distribution’s area lies between -z and z.

Q: Determine whether you can use a normal distribution to approximate the binomial

Determine whether you can use a normal distribution to approximate the binomial distribution. If you can, use the normal distribution to approximate the indicated probabilities and sketch their graphs...

Q: Find the z-score that corresponds to each percentile.

Find the z-score that corresponds to each percentile. 1. P10 2. P20 3. P99

Q: A veterinarian records the weights of dogs treated at a clinic.

A veterinarian records the weights of dogs treated at a clinic. The weights are normally distributed, with a mean of 52 pounds and a standard deviation of 15 pounds. Find the weight x corresponding to...

Q: A researcher tests the braking distances of several cars. The braking

A researcher tests the braking distances of several cars. The braking distance from 60 miles per hour to a complete stop on dry pavement is measured in feet. The braking distances of a sample of cars...

Q: The lengths of time employees have worked at a corporation are normally

The lengths of time employees have worked at a corporation are normally distributed, with a mean of 11.2 years and a standard deviation of 2.1 years. In a company cutback, the lowest 10% in seniority...

Q: List all possible samples of size n = 3, with replacement

List all possible samples of size n = 3, with replacement, from the population {1, 3, 5}. Calculate the mean of each sample. Find the mean, variance, and standard deviation of the sample means. Compar...

Q: Random samples of size 64 are drawn from the population in Example

Random samples of size 64 are drawn from the population in Example 2. Find the mean and standard deviation of the sampling distribution of sample means. Then sketch a graph of the sampling distributio...

Q: The diameters of fully grown white oak trees are normally distributed,

The diameters of fully grown white oak trees are normally distributed, with a mean of 3.5 feet and a standard deviation of 0.2 foot, as shown in the figure. Random samples of size 16 are drawn from th...