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The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed, with a mean of 3 minutes and a standard deviation of 1 minute. The quality-assurance department found in a sample of 50 customers at the Warren Road MacBurger that the mean waiting time was 2.75 minutes. At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
Find out the range (R), variance (V) and standard deviation (s) for the given set of values:
Find the probability of winning jackpot?
The average hourly wage of employees of a certain company is $9.83. Assume the variable is normally distributed.
To determine if this is evidence that students perform worse under uncomfortable conditions, The P-value of a test
Assuming the nurses surveyed were a random sample from the population of all nurses in the United States, we can use these data to test the null hypothesis H0 that there is no association between the row and column variables in this two-way table...
At α = 0.01 level of significance, test the hypothesis that these data can be described by a Poisson pdf.
Their resting heart rates were measured. A partial ANOVA table is given.
For the data giben below, prepare a R-chart. Note that the sample size is three.
Below is a normal plot of residuals from a regression. Does the plot indicate any problems with the assumption that the residuals are Normally distributed
For value 10,40,20,50 and 40, value of arithmetic mean is? Simplest measure of dispersion is the Standard deviation, variance, Quartile deviation.
what is the chance the average contents of the cans will be less than advertised and what will be the standard deviation of the number of men who help at home, based on the first survey
The Price-to-Earnings ratio (P/E) of a publicly listed profit-making company is defined as the ratio of the stock price of the company to the earnings per share.
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