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Last year, at Northern Manufacturing Company, 200 people had colds during the year. One hundred fifty five people who did no excercising had colds, and the remainder of the people with colds were involved in a weekly exercise program. Half of the 1000 emloyees were involved in some type of exercise. What is the probability that an employee will have a cold next year?
Is sample of 25 papers large adequate to give a good estimate of mean score of all 42,000 students on this exam problem? Explain your answer.
Let X denote the number of students that were on the bus carrying this randomly selected student. One of the 4 bus drivers is also randomly selected. Let Y denote the number of students on his bus. Compute the expectations of X and Y.
A medical doctor wishes to test the claim that the standard deviation of the systolic blood pressure of deep sea divers is less than 450. To do so, she selected a random sample of 20 divers and found s = 432.
What type of test is described below and can you provide the null and alternate hypothesis? Using an old manufacturing process.
When a fisherman catches a fish, it is a young one with a probability of 0.23 and is returned to the water. On the other hand, an adult fish is kept to be eaten later.
A random sample of 85 group leaders and supervisors revealed that they worked an average of 6.5 years before being promoted. The population standard deviation was 1.7 years. Using the 0.95 degree of confidence, what is the confidence interval for ..
Brake Pads- A brake pad manufacturer claims its brake pads will last for 38,000 miles. You work for a consumer protection agency and you are testing this manufacturer's brake pads.
A medical research project examined the relationship between the subject's weight and recovery time from surgical procedure, as shown in the table below.
Pollsters just report the results of hypothesis tests that show statistical significance but not those in which there was insufficient evidence.
In as sample of 855 bartenders, 48% report hearing complaints from patrons about their jobs. If the maximum error of estimate for the proportion of bartenders hearing job complaints is 4.4 percentage points, what is the degree of confidence used?
A research company stated that 20% of missed school days are due to asthma. If a group of 400 school children are selected at random, what is the probability that fewer than 70 will miss school because of asthma?
What is the probability that the person thinks that "Made in America" ads boost sales and uses social media online?
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