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Test whether there is difference between two population mean
Paramedics in a large city say they need more staff at night because they get more emergency calls then. A random sample of 7 nights showed that the paramedics received the following numbers of emergency calls during the night: 72, 81, 85, 80, 88 82, 56. A sample of 7 different days showed that the paramedics received the following numbers of emergency calls during the day: 65, 54, 81, 67, 75, 83, 79.
1. State the random variables and means in words.
2. Use a 1% level of significance to test the claim that there are more calls during the night than in the day.
The lifetime of a 2-volt non-rechargeable battery in constant use has a Normal distribution with a mean of 516 hours and a standard deviation of 20 hours. The proportion of batteries with lifetimes exceeding 520 hours is approximately.
According to table, which presents a MODI solution for a transportation problem, if that solution is used, which of the following is true.
It has been estimated that 30% of all farms are family-owned. In a sample of 12 farms, what is the probability that exactly three farms are family owned?
Stanford Binet IQ scores have a mean of 100 and a standard deviation of 15. Albert Einstein reportedly had an IQ of 160. Convert Einstein's IQ score to a z score.
Of the 1,4000 homemakers sampled, 420 were able to identify the brand by name. Compute the standard error of the proportion.
Researcher is interested in testing whether there are differences in mean between population one and population two.
What does the standard deviation mean? Interpret the standard deviation relative to the average or mean?
Findout the probability value for normal distribution. Illustrate the weight of football players is normally distributed with a mean of 200 pounds also a standard deviation of 25 pounds.
A university found that 20 percent of its students withdraw without completing the introductory statistics. Assume that 20 students registered for the course.
We are establishing a quality control program for a process and need to establish the mean and standard deviation for the process. The first 10 batches had samples of size 5 taken.
Interpret the correlation between each set of variables.
Dating In Chances- Risks and Odds in Everyday Life, James Burke claims that about 70 percent of all single men would welcome a woman taking the initiative in asking for a date. A random sample of 20 single men was asked if they would welcome the woma..
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