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Title: Find the area under the standard normal curve to the left of z = 1.25. Post by: jmountain on Mar 3, 2018 Find the area under the standard normal curve to the left of z = 1.25.
A) 0.2318 B) 0.1056 C) 0.7682 D) 0.8944 Q. 2 A medical school claims that more than 28 of its students plan to go into general practice. It is found that among a random sample of 130 of the school's students, 39 of them plan to go into general practice. Find the P-value for a test of the school's claim. A) 0.0026 B) 0.9974 C) 0.0052 D) 0.1635 Q. 3 The partially filled contingency table gives the frequencies of the data on age (in years) and sex from the residents of a retirement home. Age (yrs) 60-69 70-79 Over 79 Total Male 14 9 5 Female 6 2 4 Total What percentage of residents are female ? A) 31 B) 30.4 C) 30 D) 29.5 Q. 4 Dave drives to work each morning at about the same time. His commute time is normally distributed with a mean of 46 minutes and a standard deviation of 5 minutes. The percentage of time that his commute time exceeds 58 minutes is equal to the area under the standard normal curve that lies to the ___ of ___. A) right, 2.4 B) left, 1.2 C) right, 12 D) left, 2.4 Q. 5 A researcher wishes to estimate the proportion of all drivers who exceed the speed limit on a certain stretch of road where accidents frequently happen. Obtain a sample size that will ensure a margin of error of at most 0. 022 for a 92 confidence interval. A) 20 B) 904 C) 35 D) 1582 Q. 6 Dave drives to work each morning at about the same time. His commute time is normally distributed with a mean of 49 minutes and a standard deviation of 8 minutes. The percentage of time that his commute time lies between 41 and 65 minutes is equal to the area under the standard normal curve between ___ and ___. A) -1.5, 1.5 B) 0, 1 C) -1, 2 D) -0.5, 2.5 Q. 7 True or False: The proportion of the population that has certain characteristics is the same as the probability that a randomly selected individual of the population has these same characteristics. A) False B) True Q. 8 A company manufactures batteries in batches of 24 and there is a 3 rate of defects. Find the standard deviation for the random variable X, the number of defects per batch. A) 0.833 B) 0.818 C) 0.849 D) 0.836 Title: Find the area under the standard normal curve to the left of z = 1.25. Post by: davis578 on Mar 3, 2018 Content hidden
Title: Find the area under the standard normal curve to the left of z = 1.25. Post by: jmountain on Mar 3, 2018 Makes tons more sense now! Vote with confidence people, these are all correct
Title: Find the area under the standard normal curve to the left of z = 1.25. Post by: davis578 on Mar 3, 2018 :) Feeling super proud now
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