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The standard deviation of the lifetime of a sample of 15 electric light bulbs was computed to be 98 hours and the lifetime duration follows a normal distribution. Find a 95% CI for the standard deviation of all such electric light bulbs.
in some reports the mean and coefficient of variation are given. for instance in statistical abstract of the united
Find the probability that the mean age of those doctors is less than 53.00 years. Assume that the variable is normally distributed.
find the solution of the system of linear equations below using the gauss-jordan elimination method. enter your answer
The width of a rectangular gate is 2 meters (m) larger than its height. The diagonal brace measures sqrt 6 m. Find the width and height.
a simple random sample of size n is drawn from a population that is normally distributed. the sample mean x-bar is is
what is the percent of explained variation determined by the regression line? how do you determine the
Using an investment game, the study demonstrated that people who inhaled oxytocin were more likely to give their money to a trustee compared to people who inhaled an inactive placebo. For this experimental study, identify the independent variable a..
Abnormalities that might lead to cancer. Provide a descriptive statistic that could be used to estimate the number of women out of 1000 in this population.
At the .05 significance level, can we conclude that more than 60% of the homes have an attached garage? What is the p-value.
1. a medical researcher contends that lung capacity varies significantly between smokers and nonsmokers. the mean
In regression analysis, the residuals represent
What is the probability that the average will be 140 lbs or longer if the individuals are randomly selected and calculate the z-score for an x of 21.5 from a sample of size 25.
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