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Research shows that the life time of Everlast automobile tires is normally distributed with a mean value of 70,000 miles and a standard deviation of 7,000 miles. What is the probability of having a tire that lasts more than 80,000 miles.
When creating a 99% confidence interval for the true average difference in cholesterol levels by the drug, what is the margin of error?
Assume the population proportion is 0.17 and a simple random sample of 850 households will be selected from the population. What is the probability that the sample proportion will be within ±0.02 of the population proportion?
A sociologist claims that the success of students in college (measured by their GPA) is related to their family's income. For a sample of 20 students, the coefficient of correlation is 0.40. Using the 0.01 significance level
A unit for a telecommmunication system is to be designed so that the probability that it fails during a period of five years does not exceed 0.4. the unit is to be made up of (n) effectively identical componants each with an exponential failure di..
Assume the distribution of the length of the cuts follows a normal distribution with a standard deviation of 8 seconds. Suppose we select a sample of 16 cuts from various CDs sold by CRA CD's Inc. What can we say about the shape of the distributio..
You are given the following data. Test the claim that there is a difference in the means of the two groups. Use = 0.01. State the null and alternate hypotheses
In this continuous production process, the amount of toothpaste put in a tube is normally distributed with a mean of 8.17 ounces and a standard deviation of 0.12 ounces. If the actual capacity of the tubes used is 8.49 ounces, what proportion of t..
Evaluate percentage of households in town with one or more cars; attach standard error to be evaluate. If this is no possible, describe why not.
A sample of 64 account balances from a credit card company showed an average balance of $1,040. A previously determined population standard deviation is $200.
What proportion of 330 cci cars fall between 26 to 30 miles per gallon range? Compute the percentage of each of the car models that get 30 or more mpg.
If the researcher wants to test if the blood pressure measurements after the procedure are different from the blood pressure measurements before the procedure, what will the null and alternative hypotheses be? Treat the differences as (blood press..
A polling organization plans to sample 1000 adult Americans to estimate the proportion of Americans who think crime is a serious problem in this country. (a) What is the parameter of interest to the polling organization? (b) What will be the stati..
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