Calculus and Above

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1. The average licensed driver travels 1,536 miles per month
1. The average licensed driver travels 1,536 miles per month in his or her vehicle. Assume the population standard deviation is 429 miles per month. Determine the interval that will contain 96​% of th… read more
Scott
Master's Degree
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1. A sample of 125 is drawn from a population with a
1. A sample of 125 is drawn from a population with a proportion equal to 0.58. Complete parts ​a) through ​c) below. Click here to view page 1 of the cumulative standardized normal distribution table.… read more
Scott
Master's Degree
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A road averages 2,025 vehicles per day with a standard
A road averages 2,025 vehicles per day with a standard deviation of 505 vehicles per day. A traffic counter was used on this road on 36 days that were randomly selected. a. What is the probability tha… read more
Tom
Master's Degree
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Regular gasoline averaged ​\$2.95 per gallon in February
Regular gasoline averaged ​\$2.95 per gallon in February 2018. Assume the standard deviation for gasoline prices is ​\$0.16 per gallon. A random sample of 35 service stations was selected. Complete part… read more
Scott
Master's Degree
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According to the Bureau of Labor​ Statistics, Americans
According to the Bureau of Labor​ Statistics, Americans spent on average ​\$2,913 in 2016 on entertainment. Assume the population standard deviation of this spending is ​\$888. A random sample of 34 adu… read more
Scott
Master's Degree
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The accompanying data represent the tips left by 21
The accompanying data represent the tips left by 21 customers for the waitstaff at a local restaurant. Complete parts a through c below. ​\$19.21 ​\$10.44 ​\$12.61 ​\$7.83 ​\$14.19 ​\$9.46 ​\$11.43 ​\$16.48 ​… read more
Scott
Master's Degree
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A recent survey of 1030 employees found that 26​% of them
A recent survey of 1030 employees found that 26​% of them would lay off their bosses if they could. Complete parts a through d below based on a random sample of 10 employees. a. What is the probabilit… read more
Scott
Master's Degree
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A grocery store has 20 ​two-liter bottles of diet cola on
A grocery store has 20 ​two-liter bottles of diet cola on the​ shelf, 6 of which have exceeded their shelf life date. You randomly select 4 bottles of diet cola without checking the expiration date. C… read more
Scott
Master's Degree
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Is a salesperson for​ Camera's Etc., which is a retailer
Sara is a salesperson for​ Camera's Etc., which is a retailer for​ high-end digital cameras.​ Historically, Sara has averaged selling 2.2 extended warranties per day for cameras that she sells. Assume… read more
Scott
Master's Degree
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Consider the Poisson probability distribution with λ=10.6.
Consider the Poisson probability distribution with λ=10.6. Determine the mean and standard deviation of this distribution. The mean is nothing. ​(Type an integer or a​ decimal.) The standard deviation… read more
Scott
Master's Degree
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According to​ eMarketer, adults in the United States spent
According to​ eMarketer, adults in the United States spent an average of 92 minutes per day on social media platforms​ Facebook, Snapchat, and Instagram in 2017. Assume that minutes per day on these p… read more
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Master's Degree
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An organization installs new garage doors on residential
An organization installs new garage doors on residential homes. Suppose the installation time for a residence follows the uniform distribution with a minimum time of 170 minutes and a maximum time of … read more
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According to​ mashable.com, 37​% of Snapchat users use the
According to​ mashable.com, 37​% of Snapchat users use the app for Creativity. A random sample of 39 users was selected. Assuming this estimate is​ true, use the normal approximation to the binomial d… read more
Scott
Master's Degree
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The average number of days a house was on the market in a​
The average number of days a house was on the market in a​ city, in 2018 was 63 days. Assume the time on the market follows an exponential probability distribution. Answer parts a through d. a. What i… read more
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1. Finding Probabilities in Normal Distributions Let X
1. Finding Probabilities in Normal DistributionsLet X represent the full height of certain species of tree. Assume that X is normally distributed with a mean of 240 feet and a standard deviation of 38… read more
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A 0.1 significance level is used for a hypothesis test of
A 0.1 significance level is used for a hypothesis test of the claim that when parents use a particular method of gender​ selection, the proportion of baby girls is different from 0.5. Assume that samp… read more
Kofi
PhD in Statistics
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In a random sample of six microwave​ ovens, the mean repair
In a random sample of six microwave​ ovens, the mean repair cost was ​\$85.00 and the standard deviation was ​\$11.00. Assume the population is normally distributed and use a​ t-distribution to construc… read more
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The amount of time employees at a large corporation work
The amount of time employees at a large corporation work each day are normally distributed, with a mean of 7.8 hours and a standard deviation of 0.38 hour. Random samples of 24 and 36 are drawn from t… read more
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