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Your neighbor believes that the distribution of times it takes to mow his lawn is virtually the same as the distribution of times it takes to mow your lawn. What would you do to statistically test his claim?
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An athletics coach states that the distribution of player run times (in seconds) for a 100-meter dash are normally distributed with a mean equal to 14.00 and a standard deviation equal to 0.2 seconds. What percentage of ...
You are working with a MOE of +/-4% and a confidence level of 95%. P and Q =.50, and your CPI is $25.00. The company you work for needs to make a decision as to whether they may need different advertising for men and wom ...
Sal's Market receives a box of Jen & Barry's Fast Fresh Salad BagsTM. Each box contains 16 Caesar salad bags, 20 tossed salad bags, and 12 shredded cabbage bags. Suppose that each type salad bag has an equal chance of be ...
Out of 350 applicants for a job, 158 are female and 66 are female and have a graduate degree. Step 1 of 2: What is the probability that a randomly chosen applicant has a graduate degree, given that they are female? Expr ...
A certain diagnostic test is indicative of problems only if a child scores in the lowest 10% of those taking the test (the 10th percentile). If the mean score is 150 with a standard deviation of 30, what would be the dia ...
One study, based on responses from 1, 013 randomly selected teenagers, concluded that 43% of teenagers cite grades that their greatest source of pressure. Use a 0.05 significance level to test the claim that fewer than h ...
Sixty-seven percent of adults have looked at their credit score in the past six months. If you select 31 customers, what is the probability that at least 20 of them have looked at their score in the past six months?
"Red tide" is a bloom of poison-producing algae-a few different species of a class of plankton called dinoflagellates. When the weather and water conditions cause these blooms, shellfish such as clams living in the area ...
In a fish tank, there are 23 goldfish, 4 angelfish, and 9 guppies. If a fish is selected at random, find the probability that it is an angelfish or a guppy.?
The blenders produced by a company have a normally distributed life span with a mean of 8.2 years and a standard deviation of 1.3 years. What warranty should be provided so that the company is replacing at most 10% of th ...
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