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According to the study, the mean age of a self-employed individual is 46.6 years with the standard deviation of 10.8 years.
The Kellogg Corporation controls approximately a 43 percent share of the ready-to-eat cereal market worldwide. A popular cereal is Corn Flakes. Suppose the weights of full boxes of a certain kind of
A two-lane highway with a posted speed limit of 45 miles per hours is located just outside a small 40 homes subdivision. The residents of neighbourhood are concerned that the speed of cars on the hi
The manufacturer of a certain type of ATM machine reports that the mean ATM withdrawal is $60. The manager of a convenience store with an ATM machine thinks that mean withdrawal from his machine is
A survey of BB Gaming System console video game players gave a relative rating of at least 42 from those customers that were "very satisfied".
Hypothesis testing for the population mean.A random sample of n = 81 measurements to test Ho: μ = 40 versus Ha: μ ≠ 42, x-bar = 34 and σ = 18.
Assume we compare two population means, μ1 - μ2. In each case, indicate how μ1 relates to μ2.
Assume that a random sample of 16 measurements from a normally distributed population gives a sample mean of x-bar = 13.5 and a sample standard deviation of s=6.
Assume that a random sample of 175 stayers has a mean performance rating (on a 20-point scale) of x-bar1 = 12.8, and that a random sample of 140 leavers has a mean performance rating of x-bar2 = 14.
We suppose that we have selected two independent random samples from populations having proportions p1 and p2 and that p-hat1 = 800/1000 and p-hat2 = 950/1000.
Three bottles of wine are tasted by three experts. Each rater assigns a rating (scale is from 1 = terrible to 10 = superb).
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