Questions from Statistics Principles

Q: Using the table for the t distributions, find: (

Using the table for the t distributions, find: (a) The upper .05 point when d.f. = 6. (b) The lower .025 point when d.f = 10. (c) The lower .01 point when d.f 9. (d) The upper .10 point when d.f....

Q: A zoologist collected 20 wild lizards in the southwestern United States.

A zoologist collected 20 wild lizards in the southwestern United States. The total length (mm) of each was measured. Obtain a 95% confidence interval for the mean length.

Q: Eighteen samples of seaweed, each weighing 50 kilograms, are collected

Eighteen samples of seaweed, each weighing 50 kilograms, are collected to study the feasibility of extracting protein for use in animal feed. The 18 determinations of protein yield have sample mean 3...

Q: The monthly rent (dollars) for a two-bedroom apartment

The monthly rent (dollars) for a two-bedroom apartment on the west side of town was recorded for a sample of ten apartments. 1249 1590 1650 1625 1345 1725 1620 1200 1020 1200 Obtain a 95% con...

Q: From a random sample of size 12, one has calculated the

From a random sample of size 12, one has calculated the 95% confidence interval for µ and obtained the result (38.6, 46.2). (a) What are the x and s for that sample? (b) Calculate a 98% confidence i...

Q: From a random sample of size 18, a researcher states that

From a random sample of size 18, a researcher states that (11.1, 15. 7) inches is a 90% confidence interval for µ, the mean length of bass caught in a small lake. A normal distribution was assumed. Us...

Q: Henry Cavendish (1 731 - 1810) provided direct experimental evidence

Henry Cavendish (1 731 - 1810) provided direct experimental evidence of Newton's law of universal gravitation, which specifies the force of attraction between two masses. In an experiment with known m...

Q: One of the first investigations of the amount of persistent organic pollutants

One of the first investigations of the amount of persistent organic pollutants present in soil within an urban setting was motivated by a major flood seventy days earlier. 1 One series of measurements...

Q: In a study of the life length of a species of mice

In a study of the life length of a species of mice, 120 newborn mice are observed. The numbers staying alive past the first, second, third, and fourth years are 106, 72, 25, and 0, respectively. Let X...

Q: Given the sample 4 7 5 4 (a) Evaluate

Given the sample 4 7 5 4 (a) Evaluate the t-statistic for testing H0 : µ0 = 3. (b) Use software to check your value of t. R: t.test(x,mu=3) after x= c( 4, 7, 5, 4)