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In the national study of American high school students in 2006, researchers asked students whether they have cheated on a test in the past year.
Reconsider the previous problem regarding the age of a college student's mother when the student was born. Now suppose you want to conduct a significance test of whether the sample data provide str
An experiment was conducted to study the effect of four drugs on blood pressure. The results are given in the following table
British Columbia's own Steve Nash is current all-time NBA leader with success percentage of 90.4% based upon 2,794 made free throws out of 3,091 attempts. We are interested in whether Nash is really
Random samples of monthly rent prices, in dollars, for studio and one-bedroom apartments, were obtained for the Pennsylvania cities of Harrisburg and Philadelphia in July 2007. A 90% confidence inte
Assume Brad and Carly plan to gather separate random samples, with Brad using sample size of 500 and Carly using sample size of 1500. If Brad plans to develop a 99% confidence interval for the popul
Consider a bag containing all kinds of coins: toonies, loonies, quarters, dimes, nickels, and pennies. We are interested in testing the hypothesis of having more pennies than any other coins.
The average weight of 60 randomly chosen compact automobiles was 2620 pounds. The sample standard deviation was 430 pounds. Determine the 99.5% confidence interval of a true mean weight, m, in pound
Given the linear correlation coefficient r and the sample size n, determine the critical values of r and use your finding to state whether or not the given r represents a significant linear correlat
Using the data set of: 10, 12, 13, 15, 18, 20, 25, 27, 32, 36, 39, 40, what is the percentile rank for a score of 15?
Employ the binomial distribution in which n=6 and p=.3 to calculate the following:
A random variable follows a binomial distribution with a probability of success equal to .45. For n=11, find:
Use the binomial formula to calculate the following probabilites for an experiement in which n+5 and p=.4:
A car company claims that average price of a new car is less than $11,800 with a standard deviation of $700. You feel that the average price is more than the company claims so you check the price st
An internal study by We Fix It Up revealed that company receives an average of 21 service requests foe each day. Determine the probability that the company will receive 16 or more service request up
The needed length of a certain component that goes into assembly is 175mm. Historical data shows that the lengths of the component are normally distributed and has a standard deviation of 20mm. If y
The test scores for chosen samples of different groups of sociology students who took the course from two different instructors are shown below.
Phenotypes of Peas. Biologists conducted an experiment to find out whether deficiency of carbon dioxide in the soil affects the phenotypes of peas. Listed below are the phenotype codes, where 1 = sm
Heights of adult men are normally distributed with a mean of 69 inches and standard deviation of 2.8 inches. If an adult man is randomly selected, what is the probability that he is taller than 73.2
Heights of adult men are normally distributed with the mean of 69 inches and standard deviation of 2.8 inches. If an adult man is randomly selected, determine the probability that he is taller than
In one region, the September energy consumption levels for the single-family homes are found to be normally distributed with mean of 1050 kWh and standard deviation of 218 kWh. Determine the consum
The weekly salaries of teachers in one state are normally distributed with the mean of $490 and standard deviation of $45. Determine the probability that a randomly selected teacher earns more than
Investigator attempted to ascertain effects of hunger on aggression in cats.
Determine the margin of error in a survey using random sample of 400 people? Show your formula and calculations.