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A coin was flipped 100 times and came up heads 59 times and tails 41 times. The expected outcome was to land on heads or tails 50 times each. Do a hypothesis test to test the null that the percentage is equal to the expected as opposed to the alternative that it is greater or lesser or equal to the expected value, depending on the hypothesis.
Based on a simple random sample of one hundred an analyst estimates the average hourly wage earned by workers in a city to be $30 and computes the margin of error to be $5.
According to Chebyshev's theorem, proportion of values from data set that is further than 2 standard deviations from the mean is at most?
The number of passengers arriving at an airport terminal average 1200 each hour. To process passengers (check in, take luggage, etc) take an average of 6 minutes each. There are 6 airport staffers processing passengers. How long is the average wai..
The mean amount purchased by a typical customer at Churchill's Grocery Store is $23.50 with a standard deviation of $5.00. Assume the distribution of amounts purchased follows the normal distribution. For a sample of 50 customers, answer the follo..
Determine the confidence level used for the given confidence interval.
What type of probability distribution is appropriate for this problem? Determine the probability of getting no calls between eight and nine in the morning. Calculate the probability of getting exactly five calls between eight and nine in the morning
Consider the following age data, which is the result of selecting a random sample of 20 United Airlines pilots.
According to the U.S. Census Bureau, the mean household income in the United States in 2000 was $63,091 and the median household income was $50,054.
Conduct a two-sample test of means. A study by a bank compared the average savings of customers who were depositors for three years or less with those who had been depositors for more than three years.
Assume then money spent is uniformly distributed between these amounts. Determine the mean amount spent on insurance?
Suppose also that after selecting 15 members at random we obtained the following paired observations: Use these data to find the covariance between age and the number of visits.
The running time for videos is normally distributed with mean 390 and standard deviation 148. suppose a sample of 40 videos are selected, what is the probability that the mean running time of the sample exceeds 360 seconds?
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