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You're probably not surprised to learn that men are generaly taller than women, but what does the greater standard deviation for men's height indicate? What is the mean of this difference? What is t
For the following data, calculate the sampling distribution parameters.
If the level of confidence is 95%, what is the confidence coefficient for a two-tailed? What is the symbol for the confidence coefficient?
Can you determine the maximum error of estimate if you know the length of the confidence interval is 12.6?
If you are finding the z-score for a sample, how is it different than the z-score formula without the sample? Hint: saying one is for a sample and one is not does not clearly answer the question. Wh
Comment on the following sampling design: A researcher suggests replacing a consumer diary panel with a sample of customers who regularly shop at a supermarket that uses optical scanning equipment.
Researchers often are particularly interested in the subset of a market that contributes most to sales (for example, heavy beer drinkers or large-volume retailers). What type of sampling might be best
What is the mean and standard deviation of the number of individuals with conditions caused by outside factors? Round your answers to three decimal places (e.g. 98.765).
For each of those variables, what level of measurement (nominal, ordinal, interval, or ratio) was used to obtain data from these variables?
Assume that these expenditures are approximately normally distributed with a mean of $8.22 and a standard deviation of $1.10. What proportion of the households spent between $5.00 and $9.00?
During the past six months, 73.2% of US households purchased sugar. Assume that these expenditures are approximately normally distributed with a mean of $8.22 and a standard deviation of $1.10.
Describe what a type I and type II error would be for each of the following null hypotheses:
Write a correct null and alternative hypothesis for testing the claim that the mean life of a battery for a cell phone is at least 85 hours.
Find the standard normal curve area that lies:
A set of 50 data values has a mean of 16 and a variance of 4. Find the standard score (z) for a data value = 12. Find the probability of a data value > 12.
The principle of redundancy is used when system reliability is improved through redundant or backup components. Assume that your alarm clock has a 0.949 probability of working on any given morning a
Given a normally distributed variable X with mean 18 and standard deviation 2.5, find;
A researcher wants to test the association between 3 stress levels and 6 choices of favorite color in mature adults. The Chi-square value computed was 26.92. At the 0.05 level what should the resear
Assume that you wish to estimate a population proportion, p. For the given margin of error and confidence level, determine the sample size required.
Use a table of t-values to estimate the P-value for the specified one-mean t-test.
Compute the coefficient of determination. Round your answer to four decimal places.
Obtain the linear correlation coefficient for the data. Round your answer to three decimal places.
The number of offspring of an organism is a discrete random variable with mean nu, and variance sigma^2. Each of its offspring reproduces in the same manner. Find the expected number of offspring in
Rank the following data in increasing order and find the positions and values of both the 28th percentile and 56th percentile. Please show all of your work.