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Leticia Ramos

Leticia R.

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Questions asked

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How would you explain the concept of confidence interval to someone who has never taken a statistics course?

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Based on this article, what are some common misconceptions that are assumed to be true, even from professional researchers?

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A random sample of 11 workers produced the following data, where x is the years of employment, and y is the average number of minutes required to complete the morning duties. The data are presented below in the table of values. x y 5 49 8 42 10 41 12 39 15 37 16 34 19 30 22 25 25 24 27 22 28 16 What is the equation of the regression line? Select the correct answer below: ˆ y = 10.082 x + 54.2 ˆ y = − 1.267 x + 17.0 ˆ y = − 1.267 x + 54.2 ˆ y = 10.082 x + 17.0

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Identify the line of best fit for the data below using technology and the least squares regression method. x y 2 6 4 9 6 15 10 18 12 11 14 19 15 24 16 21 20 29 What is the intercept of the best fit line, rounded to two decimal places?

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A random sample of 11 employees produced the following data, where x is the number of shifts worked in 8 weeks, and y is number of breaks taken. The data are presented below in the table of values. x y 27 15 29 19 30 19 32 17 33 20 35 22 36 20 37 23 39 22 41 24 43 20 What is the equation of the regression line? Select the correct answer below: ˆ y = 1.803 x + 6.9 ˆ y = 0.381 x + 6.9 ˆ y = 1.803 x + 9.6 ˆ y = 0.803 x + 9.6

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A random sample of 11 university students produced the following data, where x is the minutes spent studying per day, and y is the first exam score (out of a maximum of 100 points). The data are presented below in the table of values. x y 11 39 13 55 14 43 17 46 19 69 22 75 24 77 25 78 28 77 31 93 34 92 What is the value of the intercept of the regression line, b , rounded to one decimal place?

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Two sprinters, Nick and Ryan, want to find out who has the faster time when compared to each of their teams. Nick has a time of 10.8 seconds, and his team has a mean time of 11.4 seconds and a standard deviation of 0.4 seconds. Ryan has a time of 11.2 seconds, and his team has a mean of 11.5 seconds and a standard deviation of 0.1 seconds. Who has the faster time when compared to each of their teams?

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Two basketball players, Richard and Douglas, want to find out who has the greater height when compared to each of their teams. Richard has a height of 71.5 inches, and his team has a mean height of 76 inches and a standard deviation of 3 inches. Douglas has a height of 70.5 inches, and his team has a mean of 77 inches and a standard deviation of 2 inches. Who has the greater height when compared to each of their teams?

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Two students, Ruth and William, want to find out who has the higher GPA when compared to each of their schools. Ruth has a GPA of 3.7 , and her school has a mean GPA of 3.0 and a standard deviation of 0.4 . William has a GPA of 3.75 , and his school has a mean of 3.2 and a standard deviation of 0.5 . Who has the higher GPA when compared to each of their schools?

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Given the following frequency table of values, is the mean, median, or mode likely to be the best measure of the center for the data set? Value Frequency 20 1 21 0 22 0 23 0 24 0 25 0 26 0 27 0 28 0 29 0 30 0 31 0 32 0 33 3 34 4 35 3 36 3 37 1 Select the correct answer below: Mode Mean Median

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