Question

sbrino19 In a continuous probability distribution, the probability that z will ake on n exact value a is equal to the height of the curve at that value b. is calculated using the probability density c. is always greater than 0. d. is always equal to O. e. None of these is correct. 2. Using the standard normal table, the total area between:--132ada.Ois a. 0.0494 b. 0.4656 c. 0.1554 d. 0.4162 e. 0.1005 3. The z-score representing the 10th percentile of the standard normal distribution is 2 а. 0.67 b. -0.67 c. 1.28. e. 1.645. of tow chains finds that the average breaking point is at 3,500 pounds and the standard deviation is 250 pounds. If you pull a weight of at least 4200 pounds with this tow chain, what of the time would you expect the chain to break? a, 2.8% b. 0.26% С. 49.74% d. 99.74% e.50% S A salesman who uses his car extensively finds that his gasoline bills average $125.32 per month with a standard deviation of $49.51. The probability that his bill will be more than $50 a month &less than $1 50 for a single month is: a. 0.4357 b. 0.1915. c. 0.6272 d. 0.3728. e. 0.6915. o. Given that z is a standard normal random variable and that the area to the right ofz is 0.6949, then the value of z must be: a. 0.51 b. -0.51. c. 0.86 d. -0.86 7, deviation of20. Iftheseller wishes to have adequate stock 90% ofthe tine, bow many ofthe games must she keep on hand? a. 139.2 b. 100.0 С. 132.9 d. 195.0 e. 125.6 A retailer finds that the demand for a very popular board game averages 100 per week with a standard MPORTANT For a bormal curve, if the mcan is 20 minutes and the standard deviation is 5 minutes, then between 18 and 25 miates is: a. 0.3413. b. 0.1554. c. 0.4967 d. 0.1859. then the area c. 0.2248. 4 The standard error is: a. the same value as the population standard deviation. b. is the same for distributions of all sample sizes c. is the mean of the sampling distribution d. the standard deviation of the sampling distribution. e· the squared value of the population vanice. lo A manufacturing company packages peacuts for Piedmont Airlines. The individual packages weigh .4 grams with a standard deviation of 0.6 grams. For a flight of 152 passengers receiving the peanuts, the probability that the average weight of the packages is more than 1.3 grams is: a. 0.0202. b. 0.2040. c. 0.9798. d. 0.4798. c 2.0500. The concept that allows us to drarw conclusions about the population based srictly on sample data without having any knowledge about the distribution of the underlying population is a the sormal distribation b. the standard deviation. c. the variance. d. the central limit theorem. e. the standard error of the mean 1I. The average sales por customer at a home improvement store during the past year is $75 with a 12. standard deviation of $12. The probability that the average sales per eustocner from a sample of 36 customers, taken at random from this population, exceeds $72 is: a. 09332 b. 00668. c. 0.0987 d. 0.9013. e. 0.5000 A sample of size n is sclected at randon from an infinite population. As n increases, which of the following statements is true? a. The population standard deviation increases b. The standard error of the sample mean increases . The population standard deviation decreases d. The standard error of the sample mcan decreases e. The sample mean increases. Te Coca-Cola Company has 40% of the cola market. The probability that a sample proportion for 24 falls within 0.10 of the true population proportion of 0.40, which represents the propoction bf cola drinkers who prefer a Coca-Cola drink is: a. 0.7372 b. 0.6826 c. 04599 d. 0.9198. e. not enough information given to make calculation 14 .

Answer 1

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