A survey of a random sample of 1000 smartphone owners found that the mean daily time spent communicating on a smartphone was 131.4 minutes. From previous studies, it is assumed that the population standard deviation is 2 ...
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1) Let Z be a standard normal random variable with mean = 0 and standard deviation = 1. Us the normal table to find the following answers. a) P(0 b) P(-1.22 c) Find the value Z 0 such that P(0 0 )= 0.4901. 2) On a typic ...
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Consider the distribution of 17 numbers: 6,9,11,19,23,27,29,36,41,43,47,50,51,55,58,63,67 A distribution of medical data is Normal with Mean of 40 and Standard Deviation of 10; that is N(40,10) a. Betty's score is 5.17. ...
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A budgeting Web site reported that 20?% of U.S. households have withdrawn money from a? 401(k) or other retirement account for needs other than retirement in 2013. A random sample of 11 U.S. households was selected. Comp ...
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You want to you want to estimate the mean weight of quarters in circulation. A sample of 30 quarters has a mean weight of 5.649 grams in a standard deviation of 0.066 gram. Use a single value to estimate the mean weight ...
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In a sample of 28 cups of coffee at the local coffee shop, the average temperature was 162.5 degrees with a standard deviation of 16.7 degrees. What would be the 95% confidence interval for the temperature of your cup of ...
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Two candidates face each other in an election. The Democratic candidate is supported by 58% of the population, and the Republican candidate is supported by 42%. In other words, if you randomly chose a voter and asked the ...
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You are working with a MOE of +/-4% and a confidence level of 95%. P and Q =.50, and your CPI is $25.00. The company you work for needs to make a decision as to whether they may need different advertising for men and wom ...
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1. According to the latest poll, 750 adult respondents believe in global warming. Construct a 95% confidence interval estimate of the proportion of adults who believe in global warming. Round your lower bound and upper b ...
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Next time you see an elderly man, check out his nose and ears! While most parts of the human body stop growing as we reach adulthood, studies show that noses and ears continue to grow larger throughout our lifetime. In o ...
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