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What are the two reasons you can't conclude you have demonstrated a casual relationship based on correlation research?
A large company wanted to know how the average salary of their employees had changed over the last year. The results of their study had a p-value of .12 and showed that the average salary had increa
A large midwestern state administers a statewide mathematics exam that has an average of 500. A researcher is designing a study to test the idea that students from charter schools score higher than
What are two reasons to use the t distribution to answer the following questions? Calculate a 99% confidence interval for the mean mass per peach for the population. Use the t distribution.
The number of a rare fish caught per trawl is known to have a Poisson distribution with mean equal to 1.5 fish. What is the variance of the number of fish caught per trawl?
Here is a 95% confidence interval estimate of the proportion of all jobs applicants who test positive when they are tested for drug use: 0.0262 < p < 0.0499 (based on data from Quest Diagnosti
The education level of Americans has increased throughout the 20th century. The following U.S Census data show the level of education attained by American adults over the age of 25 years at several
The average teacher's salary in X-city is $37,230. Assume a normally distribution with standard deviation of the population of $5,100. For a sample of 75 teachers, what is the probability that the s
The average number of mosquitos in a stagnant pond is 70 per square meter with a standard deviation of 12. If 9 square meters are chosen at random for a mosquito count, find the probability that the
The mean weight of loads of rock is 50.0 tons with a standard deviation of 8.0 tons. If 9 loads are chosen at random for a weight check, find the probability that the mean weight of those loads is l
The average diameter of sand dollars on a certain island is 4.00 centimeters with a standard deviation of 0.60 centimeters. If 16 sand dollars are chosen at random for a collection, find the probabi
It is estimated that the average annual salary for a registered nurse is $46,000 with a standard deviation of $1,800. If 16 random samples of 25 nurses each are randomly selected, the probability th
Wyatt Earp conducted a study of Bounty Hunters in order to determine which methods were most effective in capturing their targets and returning them for bounty. In this study, it was found that 41%
A $1000 6 % n-year par-value bond has annual coupons. it was purchased to yield 5%. The amount of interest in the first coupon is $52.89. calculate the price of the bond
Refer to the Scheer Industries example in Section 8.2. Use 6.84 days as a planning value for the population standard deviation. Assuming 95% confidence, what sample size would be required to obtain a
How large a sample should be selected to provide a 95% confidence interval with a margin of error of 10 (to the nearest whole number)? Assume that the population standard deviation is 40.
What is the 95% confidence interval estimate of the mean time it takes an individual to complete a federal income tax return (to 1 decimal)?
In the past, of all the students enrolled in "Basic Business Statistics" 14% earned A's 32% earned B's, 34% earned C's, 10% earned D's and the rest either failed or withdrew from the course.
From statements in J. R. R. Tolkien's "The Fellowship of the Ring" (Prologue I, paragraph 4), I construe that the heights of hobbits are approximately normally distributed with mean 36 inches and st
1. You are trying to determine the melting point of a new material, of which you have a large number of sam- ples. For each sample that you measure you
Determine the critical region and critical value that are used in the classical approach for testing the null hypothesis
Six measurements were made of the mineral content (in percent) of spinach, with the following results. It is reasonable to assume that the population is approximately normal.
You have been studying a population of bluebirds. You visited the site each summer and counted the number of birds. You data are as follows:
Exact and approximate methods can be used to carry out one-sample tests for a proportion. Which is true?
Exact and approximate methods can be used to carry out one-sample tests for a proportion. Which of the following is true?