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An automobile insurance firm wants to find the average amount per claim for auto body repairs. Its summary records combine amounts for body repair with all other amounts, so a sample of individual claims 'must be taken. A similar study done in the previous year shows that the standard deviation is about $400.
A 90% confidence interval with a width no greater than $50 (i.e., margin of error = $25) is wanted. How large a sample is need? Your answer should be an integer.
A 95% confidence interval with a width no greater than $50 (i.e., margin of error = $25) is wanted. How large a sample is need? Your answer should be an integer.
Does your sample size in parts a, b, and c increase as the confidence level C increases?
1. Develop the appropriate research questions and/or hypothesis for the main effects and interaction.
Normal distribution with mean $60,000 and standard deviation $8000. Four electricians are selected at random from this population to be shipped to another region.
When a researcher tests at the ,p=.05,p=.01 or p=.001 levels they can only be used in relationship to evaluate risk to patients in implementing the decisions based on research findings.
Which of the variables below do you think will be roughly normally distributed? Please select all that apply.
Find a 95% confidence interval for the mean dielectric strength of the oil.
The president of a bank is attempting to arrange a meeting with the three vice presidents for a friday
They want you to determine what the data indicate about this.In this problem I am having an issue trying to determine what equation to use to solve. Is this a one or two way ANOVA or should I just use a z-test to solve?
We are interested in testing to find out whether the variance of the population is vitally more than 0.003
let x be random variable with the following probability
Marie claims she can predict the sex of pregnant women's babies for first-time new mothers. She sees 1000 women a year, and she always predicts a female. She charges $1000 for a prediction
Provide two examples for each source of measurement error and include how each example might likely influence research results.
By how much does the standard error of x-bar change if the sample is increased to 100?
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