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How to convert a exam score (standard score) back to Percent score?
e.g. Total of students 16,
71
76
56
79
74
72
68
75
77
61
81
70
67
The average cost per night of a hotel room in New York City is $273 (SmartMoney, March 2009). Assume this estimate is based on a sample of 45 hotels and that the sample standard deviation is $65.
Generate a 95% confidence interval for the true mean total cholesterol levels in children.
When the level of confidence and the sample size remain the same, a confidence interval for a population mean µ will be wider, when the sample standard deviation s is small than when s is large.
Test the null hypothesis that these Arizona students scored the same as the North Dakota students. (238 North Dakota students had a mean of 525)What t-statistic do you obtain?
The trail was repeated 54 times with 22 correct identifications and 32 wrong identification.
Below you are given a partial computer output based on a sample of 16 observations.
ABC Auto Insurance classifies drivers as good, medium, or poor risks. Drivers who apply to them for insurance fall into these three groups in the proportions: 30 percent, 50 percent, and 20 percent, respectively.
Find the point estimate for the population proportion, the margin of error for a 95% confidence and then construct to the 95% confidence interval for the population proportion
Create a real-world situation or problem involving children who have adhd. Within state the independent and dependent variables you would study
would this prove that they are exceeding their goal, using = .025?
A researcher claims that the average age of people who buy lottery tickets is 64. A sample of 30 is selected and their ages are recorded as shown below.
A survey found that 85% of women in a given city enjoy shopping online. Suppose you randomly selected 6 women from the city and ask them whether or not they enjoy shopping online. Find the probability that exactly 4 say they enjoy shopping online.
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