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Long-term history has shown that 65 percent of all elected offices in a rural county have been won by Republican candidates. This year there are 5 offices up for public election in the county Let r
Lewis earned 85 on his biology midterm and 81 on his history midterm. In the biology class the mean score was 79 with standard deviation 5. In history class the mean score was 76 with standard devia
Researchers at a pharmaceutical company have found that the effective time duration of a safe dosage of a pain relief drug is normally distributed with mean 2 hours and standard deviation 0.3 hour.
Roger has read a report that the weights of adult mail Siberian tigers have a distribution which is approximately normal with mean μ = 390 lb and σ = 65 lb
A biologist has found the average weight of 12 randomly selected mud turtles to be 8.7 lb with standard deviation 3.6 lb. Find out a 90 percent confidence interval for the population mean weight of
How tall are college hockey players? The average height has been 68.3 inches. A random sample of 14 hockey players gave a mean height of 69.1 inches. We may assume that x has a normal distributio
Recently national average yield on municipal bonds has been μ = 4.19 percent. A random sample of 16 Arizona municipal bonds gave an average yield of 5.11 percent with a sample standard deviation
In a random sample of eight military contracts involving cost overruns, the following information was obtained. x = big price of the contract (in millions of dollars) and y = cost of overrun (expres
Which of the following best describes: measure of the degree of association found between two characteristics in a series of observations.
Conclude the median to the nearest whole number, for the following list of numbers: 20, 43, 67, 52, 67, 44, 62, 90, 21, 19, 55
A random-effects ANOVA refers to the analysis where the levels included in the study represent a random sample of all levels that exist.
The samples for each treatment must be selected randomly and independently, what is meant by treatment.
An aircraft manufacturer is attempting to establish if the average leg length of adult male has changed from 44". A sample of 81 men was selected randomly and the average length was found to be 45.5
A marketing manager wants to determine if the advertising spending per month of his competitors is equal or not. Data over the last six months reveals the following figures (in thousands of dollars)
A new drug has been developed that is found to relieve nasal congestion in 90 percent of those with the condition. The new drug is administered to 300 patients with this condition. What is the proba
The independent Department Store wants to determine the proportion of their charge accounts having unpaid balance of $500.00 or more.
The null hypothesis is H0: there is no difference in the results between the shifts.Alternate hypothesis is H1: there is a difference in the results between the shifts.
Describe the requirements that must be met before an ANOVA test can be used. Discuss what the researcher must do if one of the requirements is not met and give examples.
Please review analysis of ranked data Lind regards to the Wilcoxon signed-rank test, Wilcoxon rank-sum test, and Kruskal-Wallis test - analysis of variance by ranks. Of previously listed test which
A study is being undertaken of companies going public. Of particular interest is the relationship between the size of the offering and the price per share. A sample of ten companies that recently we
Thompson Machine Works purchased several new, highly sophisticated machines. The production department needed some guidance with respect to qualifications essential by an operator. Four variables we
Interpret the meaning of the slopes of the given multiple regression equation.Assume the regression equation that has been used to estimate value of existing homes is as follows.
define what is descriptive statistics.
Calculating mean, median, variance, standard deviation, sum of squared deviation.
Find descriptive statistics for given data.For the following scores, find out the (A) mean, (B) median, (C) sum of squared deviation (d) variance, and (e) standard deviation.