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Chemical engineers have found that the hardening time in normally distributed with mean 28.7 hours and standard deviation 6.4 hours. What is the minimal length of time the body should stay in the mo
A random sample of 25 observations was taken from a normally distributed population. The average in the sample was 84.6 with a variance of 400.
Most computer Monitors screens eventually wear out. The life of this particular brand of monitor is normally distributed with a mean life of 2000 hours and a standard deviation of 350 hours. The man
What was the lowest score earned on the exam? Assume that the distribution is normal. Based on the Empirical Rule, how many students scored between 57 and 93?
A researcher conducts a research study comparing two treatment conditions and obtains 30 scores in each treatment. If the researcher used a repeated-measures design, then how many individuals parti
Consider taking a sample of the given size from a box containing 50,000 tickets, all 0's and 1's. A sample of 400 tickets has 72% 1's. What percentage of the entire box do you expect to be 1's? What
Explain why the sequence is important. What might happen if the hypothesis test is performed before the researcher has decided on the significance level?
A member of Congress wants to determine her popularity in a certain part of the state. She indicates that the proportion of voters who will vote for her must be estimated within plus or minus 2 per
Let the random variable C denote the price of a book in dollars. If C = 4 + 0.1*P, what is the expected value of the price of a book?
Probability about 0.2 of suggesting that the person is deceptive. What is the probability that the number classified as deceptive is less than the mean?
A market research firm conducts telephone surveys with a 44% historical response rate. What is the probability that in a new sample of 400 telephone numbers, at least 150 individuals will cooperate
Assume that the president is correct and p = 0.26. What is the sampling distribution of for this study? What is the probability that the sample proportion will be between .20 and .40 (to 4 decimals)?
most computer monitors screens eventually wear out. the life of this particular brand or monitor is normally distriubuted with a mean life of 2000 hours and a standard deviation of 350 hours. the ma
Its known that 5% of all AA bateries made by Power Manufactures are defective. AA batteries are sold in packs of 4
The standard deviation of this poll is 4%. What would be the standard deviation if the sample size were increased from 93 to 187?
A medical researcher is interested in whether patients' left arms or right arms are longer. If 8 patients participate in this study (so that n left arms and n left arms are measured), how many degre
The interval 9.5 to 12.5 gallons per minute. Find the probability that between 10.0 gallons and 11.0 gallons are pumped during a randomly selected minute.
What is the z a/2 for a confidence level of 95%, the margin error of this sample and give a 95% confidence interval for the mean weight of boxes produced based on the sample mean of 16.4?
A Quality check process of a certain brand of sports car includes ultrasonic paint thickness check. In order to pass the check, paint thickness should be in between 4 and 5 mils. Assume that cars ar
If there are 75 students in the class, what is the probability the professor needs more than 6 hours to mark all of the midterms?
What is the 95% confidence interval estimate of the population mean examination score if a sample of 200 applications provided a sample mean ? (4%)
Computed and shown to exceed the critical value for this data. The data is double checked and verified. This shows that car wrecks cause ice cream sales.
We further know that scores on the McCroskey scale are normally distributed. What is the probability that a randomly selected person scores less than 30?
In the police department of a large city with an average height of 71 inches and a standard deviation of 2.3 inches, what is the probabilty of encountering an officer in that city who is 73 inches
Briefly describe correlational research. Name a variable from this study and one from the workplace that might prove to provide a correlational relationship and explain why you would choose these tw