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A sample of 35 workers was randomly selected from a workforce of 110 to estimate the average amount spent weekly at a canteen by each worker.the sample meam was $13 and the sample standard deviation w
Find the standard deviation from the fallowing data
This question has to do with power. Suppose in a clinical study you have two groups with 10 subjcects in each group. No significance at the .05 level is found but there is a medium effect size, which
Does dichotomizing the dependent variable (i.e. logistic regression) decrease power in relation to a continuous dependent variable?
The table on page 124 indicates XRAY was the only variable input into the equation and the model’s overall percentage correct was 75.47%. On page 125, STAGE was entered into the equation, but it
The average cost for service provided per person per day is random variable with normal distribution of N$ 100 and a standard deviation of N$ 22. What is the probability that the cost will be at least
British airways employs you as cunsultant to analyse the departure time of flight leaving Cape Town International Airport. The acceptance time frame for departures is 0 for on-time plus or minus 15 mi
A population of size 1,000,000 claims has mean cycle time of 15 days, and a standard deviation of 4. 100 random samples of each size 64 are selected. What will be the approximate standard deviation of
In Eurelia there are three categories of bicycle license, with different fees for each. The table below is based on a random sample of 122 Eurelian bicycle-license holders.
An international marketer has said, "When political instability increases, the price of quality increases." Think about the potential issues with measurements and data collection. Is this a testable h
In May 1998, the New York Times carried an article by Adam Bryant describing a research project to relate two rather diverse phenomena: the performance of a Fortune 500 company, and the golf game of i
A self proclaimed psychic was tested with 100 cards face downand asked to determine what symbol, out of 5 possible symbols the card hado n it. How many would this person need to get right for us to be
If one person is selected at random from these young ones, find the probability that this person is employed given that the person is male.
The mean and standard deviation for the quality point averages of a random sample of 36 college seniors are calculated to be 2.6 and 0.3
In studying the behavior of air support roofs, the random variables X, the inside barometric pressure (in inches of mercury) and Y, the outside barometric pressure are considered. Assume that the join
The applicants require to take the university examination for admission in engineering collage. Scores on the university are roughly normally distributed with a mean of 530 and a standard deviation of
Detailed description of -the mean deviation about for the numbers 4/11, 6/11, 8/11, 9/11, 12/11. 8/11 is and 2nd question is the mean and SD for a,b and 2 are 3 and 2/sqrt3 respectively. The valu
To examine the effectiveness of its four annual advertising promotions, a mail order company has sent a questionnaire to each of its customers, asking how many of the previous year's promotions prompt
The advertising firm of McMann and Tate has put out bids for two separate contracts. Based on past experience, they believe that they have a 0.7
Suppose that the number of customers who enter a supermarket each hour is normally distributed with a mean of 570 and a standard deviation of 170.
A 12 ounce bottle of beer has 355 ml. The Random Brewing Company sets its machinery so that the contents of a bottle is normally distributed with a mean of 355.5 ml and a standard deviation of 1 ml. (
If the mean is 24 inches and the SD is 4.5 inches, What is the height of a plant with a z score of 0? My question is what is the formula used to solve this?
The probability that husband and wife will b alive after 20 years from now is 0.8 and 0.9 respectively.find the probability that in 20 years time 1. both will b alive 2. neither of them will b alive 3
Three vehicles with a carrying capacity of 12 passengers each are used to ferry 30 international tourists and 5 local tourists from or tambo airport to vilakazi street,soweto. if the logistics manager
In a BMT class test the scores of 8 students are: 11; 10; 6; 3; 11; 10; 9; 11. Assume the sores are a simple random sample from a normally distributed population. What is the point estimate of the sta