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According to Cellular Telecommunications industry Association, the average local monthly cell phone bill is $42.78. Suppose local monthly cell phone bills are normally distributed, with a standard deviation of $11.35.
a) What is the probability that a randomly selected cell phone bill is more than $67.75?
b) What is the probability that a randomly selected cell phone bill is no more than $25?
Confirm whether given random variable is binomial distribution or not. If this experiment is finished with replacement, explain why.
Can we conclude that there is a positive association between the size of the home and the selling price? Use the .05 significance level.
The average gas mileage of a certain model car is 29.0 miles. If the gas mileages are normally distributed with a standard deviation of 0.6 miles per gallon, find the probability that the car has a gas mileage of between 28.8 and 29.2 miles per ga..
They are asked if they use a laptop in class to take notes. Suppose that based on the survey, 220 of the 400 students responded "yes". a) What is the value of the sample proportion ^p ? b) What is the standard error of the sample proportion?
A manager of a large department store with three floors reports that the time a customer on the second floor must wait for an elevator has a uniform distribution ranging from 0 to 16 minutes. It takes the elevator 1 minute to go from floor to floo..
For the most recent year available the mean annual cost to attend a private university in the US was $26,889. Assume the distribution of annual costs follows a normal probability distribution and the standard deviation is $4,500. 95% of all studen..
Computing the mean, standard deviation values for the given data - Describe how statistics is being misused in this situation
Taking care to control for weather conditions and other variables as much as possible. Define the null hypothesis.
Explain probability distribution of X (name and parameters).
A Starbucks manager decides to study waiting times of customers for service at the lunch time rush hour 1100-1200. He observes three customers to measure the time the customer enters the line to the time he or she reaches the counter.
Calculate the standard error of estimate for the regression equation.
For the following hypothesis test where H 0 : m £10 vs. H a : m >10, we reject H 0 at level of significance a and conclude that the true mean is greater than 10 when the true mean is really 8.
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