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Can the binomial distribution be used to model the number of rare events that occur over a given time period?
Is there evidence to suggest a difference in the mean waiting times at the four body shops? Use the .05 significance level.
If one item is chosen at random, determine these probabilities. It is a TV
Calculate a 90% confidence interval for the percentage of homes in the US that had guns at the time of survey.
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
According to the Sleep Foundation, the average night's sleep is 6.8 hours. Assume the standard deviation is 0.6 hours and the probability distribution is normal. a. What is the probability that a randomly selected person sleeps more than 8 hours?
An occupational health study was carried out to evaluate the health status of workers. The response is forced expiratory volume (FEV), a measure of respiratory function
Assume that p-value was 0.07, would you reject null hypothesis of equal mean rates for a Type- I error rate of 5%? (Circle one).
Which of the following assumptions for inference about a proportion using a confidence interval are violated,
A doctor believes that the standard deviation of systolic blood pressure is 450. A random sample of 24 patients found a standard deviation of 520. Assume the variable is normally distributed and a = 0.01. What are the critical values?
What is the probability that the mean annual precipitation during 49 randomly picked years will be less than 101.8 inches?
A company makes camshafts. The camshaft lengths need to be within a certain tolerance or they will not fit. They have produced x bar and s charts
Time spent using e-mail per session is normally distributed, with μ = 8 minutes, and σ = 2 minutes. If you select a random sample of 25 sessions,
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