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A study of 40 bowlers showed that there average score was 186 the standard deviation of the population is 6. Uncover the 95% confidence interval of the mean score for all bowlers.
The Napa Valley extends for 30 miles to the north of San Francisco. The average temperature decreases as one moves south, closer to San Francisco Bay and the cold ocean waters. West Abbey grapes c
Test the claim at 6 percent level of significance that µ is less than 35 given a sample size of 39, a sample mean of 32 and a sample standard deviation of 11.
The athletic department of a university claims that its graduation rate this year is more than the 62 percent graduation rate a year ago. A sample of 45 existing athletes showed that 32 graduated. A
Noise level tests were done on 50 new light rail vehicles. The results of the test gave a sample mean of 75 decibels and a sample standard deviation of 8 decibels. Find out a 90 percent confidence i
How large would the sample need to be to guarantee an error of no more than 3.4 on a 96 percent confidence interval for the mean of a population with the standard deviation of 19.
An experiment was conducted to evaluate the effectiveness of five different weight reducing agents. A random sample of 50 males was at random divided into five equal groups, with preparation A assig
An experiment was conducted to compare the effectiveness of 5 different weight reducing agents. A random sample of 50 males was at random divided into five equal groups, with preparation A assigned
A study of accounts receivable at A & W Department stores are either current, one month overdue, two months overdue, written off as bad debt or paid in full.
Mike manages a theater complex known as Cinema I, II, III and IV. Each of the 4 auditoriums plays a different film; the starting times are staggered to keep away from the large crowds.
The Cinema has one ticket booth and a cashier who can maintain an average service rate of 280 patrons per hour. Service times are assumed to follow an exponential distribution. Arrivals on a typic
Measures of variation and measures of center for the given data.Compute the Measures of Center and Measures of Variation for following data set representing the chest size of 20 bears in inches.
A study of consumer smoking habits includes 161 people in the 18-22 age bracket, 50 who smoke. There are 144 people in the 23-30 age bracket, 35 who smoke, and 80 people in the 31-40 age bracket, 28
When 343 college students are randomly selected and surveyed, it is found that 110 own a car. Construct a 99 out confidence interval estimate of the true proportion of all college students who own a
An Accountemps survey of 150 executives showed that 44 out of them say that "little or no knowledge of the company" is the most common mistake made by candidates during job interviews (based on data
Hypothesis testing for population correlation coefficient and linear regression equation.Listed below are annual income (in thousands of dollars) and the amount of life insurance (in thousands of do
Find the standard normal score (Z-score). Your class took a test and the students earned the following scores.
Your friend is in a different section of the same subject. She also took a test and the class mean was 70 with a standard deviation of 2.3 points. Both you and your friend scored a 73. Comparatively
A manufacturing process has 78 percent yield, which means 78 percent of the products are acceptable. If six of the products are randomly selected (with replacement), find the likelihood that all are
Women have a mean height of 63.60 inches with a standard deviation of 2.50 inches. If the military wants to design equipment so that it fits 90 percent of the adult female population, what are the m
The weekly salaries of teachers in one state are usually distributed with the mean of $620 and a standard deviation of $65. What is the probability that a randomly selected teacher earns less than $
A final exam in Statistics has the mean of 75 with a standard deviation of 9.2. What is the possibility that a randomly selected student has a test score that is more than 85.
IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. What is the likelihood that a randomly selected student in our statistics class has an IQ between 85 and 95.
To qualify for police academy, candidates must score in the top 20 percent on a general ability test. The test has a mean of 300 and a standard deviation of 50. Find out the lowest possible score a
The mean lifetime of a TV by a certain manufacturer is 10.5 years with a standard deviation of 3 years. If the distribution is normal, for how many years should the manufacturer give a replacement g