Questions from Essentials of Statistics

Q: For a population with σ = 16, how large a sample

For a population with σ = 16, how large a sample is necessary to have a standard error that is a. equal to 8 points? b. equal to 4 points? c. equal to 2 points?

Q: If the population standard deviation is σ = 24, how large

If the population standard deviation is σ = 24, how large a sample is necessary to have a standard error that is a. equal to 6 points? b. equal to 3 points? c. equal to 2 points?

Q: Metacognition is an understanding of one’s own cognitive processes, like thoughts

Metacognition is an understanding of one’s own cognitive processes, like thoughts, perceptions, and memory. In a recent study of metacognition in monkeys, a researcher presented monk...

Q: A sample of n = 36 scores is selected from a normal

A sample of n = 36 scores is selected from a normal distribution with a mean of μ = 65. Compute the z-score for a sample mean of M = 59 and determine whether the sample mean is a typical, representati...

Q: A sample is selected from a population with a mean of μ

A sample is selected from a population with a mean of μ = 100 and a standard deviation of σ = 20. a. If the sample has n = 16 scores, what is the expected value of M and the standard error of M? b. If...

Q: Describe the distribution of sample means (shape, mean, and

Describe the distribution of sample means (shape, mean, and standard error) for samples of n = 64 selected from a population with a mean of μ = 90 and a standard deviation of σ = 32.

Q: Under what circumstances is the distribution of sample means guaranteed to be

Under what circumstances is the distribution of sample means guaranteed to be a normal distribution?

Q: Gentile, Lynch, Linder, and Walsh (2004) surveyed

Gentile, Lynch, Linder, and Walsh (2004) surveyed more than 600 eighth- and ninth-grade students regarding their gaming habits and other behaviors. Their results showed that the adolescents who experi...

Q: A random sample is selected from a population with a standard deviation

A random sample is selected from a population with a standard deviation of σ = 18. a. On average, how much difference should there be between the sample mean and the population mean for a random sampl...

Q: For a sample of n = 36 scores, what is the

For a sample of n = 36 scores, what is the value of the population standard deviation (s) necessary to produce each of the following standard error values? a. σ M = 12 points b. σ M = 3 points c. σ M...