These measures give a range where a certain percentage of the data fall. O Measures of Central Tendency Measures of Variation Measures of Position O None of the above
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- Cost and Customer Satisfaction A researcher is interested whether there is a linear correlation between cost (in dollars) of internet service per month and customer satisfaction on a scale of 1 - 10 (with a 1 being extremely dissatisfied and 10 extremely satisfied). The researcher only includes internet service with similar download speed. The sample he collected is below. Cost (x) 20 18 15 11 9 11 15 19 18 30 Satisfaction (y) 6 8 10 4 9 6 13 5 2 10 Find the best predicted value for the level of Customer Satisfaction given that the Cost is 13. Use a significance level of 0.05. Round your answer to 1 decimal place, if needed.Variables Age at which first child was born AGEKDBRN Survey question: How old were you when your first child was born? Respondent’s sex SEX Respondent’s sex (1 = male or 2 = female) Descriptive Statistics: Sex n Mean Std. Dev. Min. Q1 Median Q3 Max. IQR male 679 25.5 5.91 12 21 25 29 51 8 female 987 23.4 5.45 13 19 22 27 45 8 Descriptive Statistics: Group Sample Size Mean Std. Dev. female 987 23.44 5.45 male 679 25.55 5.91 Question: Find the 95% confidence interval for the difference between men and women in the mean age at which their first child was born and report the results below. Find the confidence interval for the difference (mean for men – mean for women). Describe in words what the confidence interval shows about the difference in the mean age at which men and women have their first child.Data for fuel economy ratings in mi/gal for different cars are listed below. Each pair of data represents the rating using the Old test and the New test. Old 30 22 23 31 27 21 20 19 28 16 New 25 18 25 26 23 18 17 16 31 19 Based on the previous values you found, what can you conclude regarding the linear correlation between the Old and New test method? Since the absolute value of r is ____________ the positive critical value, there _____________ between the Old and New test method for fuel economy rating.
- Which one of the following statements is true? The correlation coefficient is not affected by outliers. O In the context of correlation and regression, as long as the correlation is strong, it's okay to infer that the explanatory variable causes the response variable. O The "P" in P-value stands for "practical." O The slope in a regression equation tells us what we predict y to be if x is equal to 0 O It is not necessary to know the population size in order to compute the standard deviation of the sampling distribution.Frequency Mean Median Mode O Scores Which of the following best describes the graph above? Histogram Frequency polygon Normal distribution Positively skewed distribution Negatively skewed distribution D G € D E t EFind the measures of center for following. Frequency 2 1 4 5 5 11 13 19 13 Data 40 - 44 45 - 49 50 - 54 55 - 59 60 - 64 65 - 69 70 - 74 75 - 79 80 - 84 mode = median = mean = 87.83 X (round to 4 decimal places)
- Time left 0:13B34 Given below are the annual number of divorce certificates registered in Oman by year between 2010 and 2019 as published by the NCSI. Find the percentile rank of 3663 divorces. Year Divorces 2010 2736 2011 3805 2012 3570 2013 3550 2014 3622 2015 3619 2016 3736 2017 3867 2018 3663 2019 3728 ColestX Y 14 25 26 28 19 27 13 21 28 31 23 24 30 31 26 27 19 29 Mean. 22 27 Std. Dev 6.08 3.28 Correlation 0.76 What is the t value using the direct difference approach? (report positive t-value)IQ tests supposedly measure our intelligence. They typically are ‘normed’ so that they have a mean of 100 and a standard deviation of 15. (Higher scores show higher intelligence.) Use the graph and use the z-score and percents from columns b and c in Table A, when relevant. If you scored 132, what is your z-score? (Interpret.) Use table A X, z(a), (b), and (c) X z (a) (b) (c) and use the graph! Write down or save your response to use in Part 2 of this quiz. Group of answer choices -2.53 z. I'm at the 98.34 percentile rank and 1.66% of people scored smarter than me. 2.13 z. I'm at the 98.34 percentile rank and 1.66% of people scored smarter than me. -2.13 z. I'm at the 1.66 percentile rank and 98.34% of people scored smarter than me. 2.53 z. I'm at the 0.57 percentile rank and 99.43% of people scored smarter than me. 2.13 z. I'm at the 1.66 percentile rank and 98.34% of people scored smarter than me. 2.53 z. I'm at the 99.43 percentile rank…