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31% of the population are shorter than 66 inches, what is the probability a randomly selected member of this population is between 66 and 76 inches tall?
Chocolate bars produced by a certain machine are labeled with 8.0 oz. The distribution of the actual weights of these chocolate bars is Normal with a mean of 8.1 oz and a standard deviation of 0.1 o
A random sample of 60 of M.O.R.O.N.'s members were asked if they want M.O.R.O.N. to change its name. How many of the respondents, at a level of significance of 0.05, would need to say that they want
A study of chromosome abnormalities and criminality examined data from 4,124 males born in Copenhagen. Construct and interpret a 95% confidence interval for the difference in proportions.
In Cleveland, a sample of 73 mail carriers found that 10 had been bitten by an animal during one week. In Philadelphia during the same week, in a sample of 80 mail carriers 16 had been bitten. At th
How many city residents must be surveyed in order to have a 95 percent confidence interval with a precision of plus/minus 3 trips per month. A pilot study found that the standard deviation was 14 tr
A survey claims that 9 out of 10 doctors (i.e., 90%) recommend brand Z for their patients who have children. To test this claim against the alternative that the actual proportion of doctors who reco
On the second exam, she scored 82; the mean was 74 and the standard deviation was 5. On which exam did she do better?
What can we conclude about the significance test of Ho: mu = 2.6 vs Ha: mu does not equal 2.6 ?
The advisor of an ecology club at a large college expects that the group consists of 10% freshman, 20% Sophomores, 40% Juniors and 30% Seniors. The membership for the club this year is observed to b
The mean television viewing time for Americans is 15 hours per week. What is the probability that the sample mean will be within 1 hour of the population mean.
The amount of juice squeezed from each of these apples is approximately normally distributed with a mean of 2.25 ounces and a standard deviation of 0.15 ounce. 77% of the apples will contain at leas
Show the sampling distribution of the mean amount of Medicare spending for a sample of fifty 2003 enrollees.
A student comes to class with four different colored balls of identical shape and size in her pocket. She has decided to draw one ball from her pocket per question and allow the color of the ball to
One of the 4 bus drivers is also randomly selected. Let Y denote the number of students on his bus. Compute the expectations and variances of X and Y?
A survey conducted by 1000 patients on the amount of wait time in the Emergency Room, resulted in data that was approx. normally distributed. The mean wait time was 60 minutes and the standard devia
Eight randomly selected plants have heights 172, 156, 154, 163, 170, 169, 170 and 164 cms. Test whether the sample standard deviation differs significantly?
A political strategist claims that 57% of voters in Madison County support his candidate. In a poll of 400 randomly selected voters, 204 of them support the strategist's candidate. At = .05, is the
In Layman's terms, what is the difference between an observational study and an experimental study? My question is from: Researchers asked a sample of 50 1st grade teachers and a sample of 50 12th g
How many months must be sampled for analysis to be 99% confidence that the error in estimating the average monthly price of gasoline is at most $0.03. Assume the standard deviation is $ 0.05.
The standard deviation, over a long period of time, was computed to be 0.150 mm. What percent of the ball bearings on this line will have diameters of 20.27 mm or more?
What is the value of the sample proportion p who so they are satisfied with the total cost they pay for their health care? Explain in words what the population parameter p is in this setting.
Values are over 2.1 pounds and 5% are under 1.9 pounds, what are the mean and the standard deviation for the population of products produced with this process?
Assuming a population standard deviation of 2.5 for both golfers, what is the value of the test statistic?
Indicate what two populations are being compared, (b) state the research hypothesis, (c) state the null hypothesis, and (d) say whether you should use a one-tailed or two-tailed test and why.