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12 mature citrus trees of one variety and 15 of another gave means and standard deviations of their heights as 13.8 and 12.9 ft (means), and 1.2 and 1.5 ft
Of 300 people waiting lunch at a department store cafeteria, 102 had dessert. What is the confidence associated with a Rao score interval of length .1
Children's scores on a measure of aggression are known to have a normal distribution, with a mean of 50 and a standard deviation of 6.
The figure below shows the probability histogram for the total number of spots when a die is rolled eight times. The shaded area represents the chance
To aid in planning the development of a tourist shopping area, a state agency wants to estimate the average dollar amount spent by a tourist in an existing shop
In an effort to estimate the mean amount spent per customer for dinner at a major Atlanta restaurant, data were collected for a sample of 49 customer
Eight chemical elements do not have isotopes (different forms of the same element having the same atomic number but different atomic weights)
What proportion of Americans get most of their news from the internet? According to a poll conducted by Pew Research Center, 40% get most of their news
If sample mean = 85, and n=64, construct a 95% confidence interval estimate for the population mean, mu.
A corporation owns several companies. The strategic planner for the corporation believes dollars spent on advertising can to some extent be a predictor
When is it appropriate to use stratified random sampling.
The mean + sd of In [calcium intake (mg)] among 25 females, 12 to 14 years of age, below the poverty level is 6.56 + 0.64.
A human society claims that less than 35% of U.S. households own a dog. In a random sample of 400 U.S. households, 156 say they own a dog.
Heavy duty light bulbs made by a certain company claim to have lives that are normally distributed with a mean of 5000 hours and a standard deviation of 400
The number of staff personnel needed to handle patients at a medical center is determined by the mean time that patients must wait before being attended
In the week before and the week after a holiday, there were 10,000 total deaths, and 4972 of them occurred in the week before the holiday.
Find t-value for sample size n = 16 and area to the right 0.10
If a random sample of 10 people found that 9 were pro-life (i.e., 90%), while another random sample of 1000 people from the same population
A sample of n=9 college students is used to evaluate the effectiveness of a new Study Skills Workshop.
Numerous studies have found that males report higher self-esteem than females, especially for adolescents (Kling, Hyde, Showers, & Buswell, 1999).
Annual family dental expenses for the families of a random sample of ten employees of a company are given below. You can assume the family dental expenses
The following table lists the results of one question taken from a survey conducted for Joe's Bar and Grill. The Grill has recently undergone renovation
Run descriptive statistics on this data set and interpret the meaning (this does not mean just repeating the numbers)
A simple random sample of 40 salaries of NCAA football coaches has a mean of $415,953 and a standard deviation of $463,364. Construct a 95% confidence
A sample of 64 statistics students at a small college had a mean mathematics ACT score of 28 with a standard deviation of 4. Estimate the mean