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Suppose the age of buyers were collected and the data follows the bell curve (a normal distribution). The buyers had an average age of 41 years and a standard deviation of 7. You plan to take a random sample of 68 buyers and calculate a sample mean. Directions: Fill in the blanks and click the button to have your answers graded.A. Do not round intermediate calculations. B. For questions 1-3 enter a number between 0 and 1 rounding it to four places.C. Round your answer to question 4 to two decimal places.1. What is the probability of finding a sample mean less than 40.96 years? = 2. What is the chance of finding a sample average with a value greater than 41.84 years? = 3. What is the probability of finding a sample average within 2.16 years of the population mean? = 4. What two values of the sample mean cut off the center 16% of the sampling distribution?Lower Value: = Upper Value: =
Assuming that the data constitute independent random samples from normal populations with equal variances, construct a 99% confidence interval for the difference between the true average heat-producing capacities of coal from the two mines.
Statistics from Cornell's Northeast Regional Climate Center indicate that Ithaca, NY, gets an average of 35.4" of rain each year with a standard deviation of 4.2". Assume the data is normally distributed.
part i introduction this section should include some perspective about the problem you are trying to analyze in other
EIHP Assessment 2 – Interpreting Basic Statistical Data, Article: Ramirez, G. & Beilock, S.L. (2011). Writing about testing worries boosts exam performance in the classroom. Science, 331. 211-213. This article is page 74-77 of your handbook.
Construct and interpret a 95% confidence interval estimate of the difference in the mean measurements in-lineand from an analytical lab.
Explain why you would choose the specific test.
Consider a sample of 148 small businesses. During a three-year period, 15 of 106 headed by men and 7 of the 42 headed by women failed. Let p1 be the proportion of businesses headed by women that failed. Let p2 be the proportion of businesse..
This variable represents the number of machine breakdowns during a day, based on this simulation run, what is the average number of breakdowns per day?
Let X be the sample mean of a random sample of size n from a uniform distributionon the interval [0, b], and let bb = 2X be an estimator of the upper endpoint b.(a) Demonstrate that bb is an unbiased estimator of b, and find the variance of th..
SPC is one of a number of tools which can be used to improve manufacturing quality standards - Outline two techniques which can be used to decide where to put SPC effort most effectively.
condence interval fornbspmu when sigma is knownsuppose n 9 people are selected at random from a large population.
An astronomer at the Mount Palomar Observatory notes that during the Geminid meteor shower, an average (?) of 50 meteors appears each hour, with a variance (σ2) of 9. The Geminid meteor shower will occur next week.
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