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A random sample has been taken from a normal distribution. Output from a software package is given below:
variable: x
N: 10
mean: ?
xbar: 25.185
sigma: 1.605
variance: ?
sum: 251.848
Mean: ___________ ( I got 25.18, please let me know if correct?)
Variance: ___________
Extra: Find the 95% confidence interval on the population mean for the preceding problem.
She wants to be 95% confident that her estimate is correct. If the standard deviation is $1050, how large a sample is needed to be accurate within $200?
4. Although most of us buy milk by the quart or half gallon, farmers measure daily production in pounds. Ayreshire cows average 47 pounds of milk a day with a standard deviation of 6 pounds. For Jersey cows, the mean daily production is 43 pounds wit..
She knows that each order for these bills costs $300 for clerical and armored car delivery costs, and that order lead time is six days. Assuming a thirty-day month, if she were to order 6,000 bills at a time, what would be the length of an order cy..
an average computer mouse inspector can inspect 55 mice per hour with a population standard deviation of 14 mice per
the probability that an individual has 20-20 vision is 0.15. in a class of 50 students what is the mean and standard
Repetitions of numbers are not permitted, i.e., the same number cannot be used more than once in a total sequence. As examples, 27, 94 or 55 would not be permitted. How many different code groups can be designed?
The correlation between IQ and the verbal SAT score among the seniors at GWB High School is .90; it is significant. The mean IQ is 100 with a standard deviation of 10.
What is the correct answer to Suppose you were trying to decide which of two machines to purchase. Furthermore, suppose the length to which the machines cut a particular product part was important.
in a recent study of 44 eighth graders the mean number of hours per week that they watched television was 19.5 with a
Find the probability of correctly answering the first 2 questions on a multiple choice test if random guesses are made and each question has 3 possible answers.
Where Z~N(0,1). Also let [empty set symbol] denote the standard normal density function. Show that, d/dx [empty set symbol] (- square root of x) = -1/2 x^-1/2 [empty set symbol] (-square root of x).
Using the results, describe the effect of an outlier or extreme value on the confidence interval.
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