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Kindergarten children have heights that are approximately normally distributed about a mean of 39.7 inches and a standard deviation of 2.2 inches. If a random sample of 21 is taken, what is the probability that the sample of kindergarten children has a mean height of less than 38.9 inches? (Give your answer correct to four decimal places.)
Exact answers only please.
The mean weight for a certain type of fish is known to be 28.0 ounces with a standard deviation of 2.5 ounces . A game warden catches and weighs 30 fish from a certqin pond to check if they are larger than the mean stated above.
The following ANOVA summary data are the result of a regression with sales per year (dependent variable) as a function of promotion expenditures per year (independent variable) for a toy company.
Calculate a -way anova situation. suppose a school psychologist a classroom setting and you want to find the effect that five teaching styles.
15% were contaminated with salmonella, and 13% were contaminated with both of these bacteria. What is the probability that a tested chicken chosen at random is: contaminated with salmonella and not campylobacter.
Critically discuss the probability that more than 175 cable households rate cable companies as good or excellent in quality transmissions?
If the shop does not want to give more than 1% of its customers a free lube and oil change service, how long should the guarantee be?
At most, only 30 newspaper ads are possible. For every 106.7 radio ad, there must be at least two 103.1 Radio ads. Formulate the LP model to determine the number of ads in each outlet and maximize the effective audience contact.
Give a 99% confidence interval for the mean increase in pay for all corporate CEOs.
A shop manual gives 6.5 hours as the average time required to perform a 30,000 mile major maintenance service on a Porsche 911. Last month a mechanic performed 11 such services, and his required times were as follows.
Before the rush began for Christmas shopping, a department store had noted that the percentage of its customers who use the store's credit card, the percentage of those who use a major credit card, and the percentage of those who pay cash are the ..
1. a random variable is binomially distributed with n 16 and pi .40. the expected value and standard deviation of the
Determine the coefficient of determination (Use Megastat or Excel, Tools, Data Analysis, Regression function). Interpret the result.
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