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statistics/normal distribution
If np is greater than or equal to 5, and nq is greater than or equal to 5, estimate P(fewer than 8) with n =14 and p = 0.6 by using the normal distribution as an approximation to the binomial distribution; if np < 5 or nq < 5,
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In a normal distribution, what zscore value separates the highest 90% of the scores from the rest of the distribution? a)z = 1.28 b)z = 1.28 c)z = 0.13 d)z = 0.13
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What is the probability of randomly selecting a zscore less than z = –0.80 from a normal distribution. a)0.2119 b)0.7881 c)0.2119 d)0.7881
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Which of the following statements are correct? a. A normal distribution is any distribution that is not unusual. b. The graph of a normal distribution is bellshaped. c. If a population has normal ditribution, the mean and the
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Which of the following statements is true about the tdistribution with k degrees of freedom? i. the tdistribution is symmetric ii. the tdistribution with k degrees of freedom has a smaller variance than the tdistribution with
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Over the past 10 years, the local school district has measured physical fitness for all high school freshmen. During that time, the average score on a treadmill endurance task has been μ 19.8 minutes with a standard deviation
asked by Nickie on January 27, 2013 
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Scores on the SAT form a normal distribution with u=500 and o=100. a. You are trying to qualify for a scholarship and find out that you need to have a higher score than at least 75% of the students. What score will you need? b.
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The weights of individual nails produced by the 'Hammer 'n Nail' hardware company follow a normal distribution with the average nail weight being 5.1 grams and the standard deviation in nail weight being 1.6 grams. When a nail is
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The score distribution of the final exam in a data science course follows a normal distribution with mean 70 and standard deviation 10. Let α in (0,1) . As a reminder, the quantile of order 1−α of a random variable X is the
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Does anyone know how to solve for this Suppose that a principal of a local high school tracks the number of minutes his students spend texting on a given school day. He finds that the distribution of minutes spent texting is
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