Unhealthy Days in Cities The number of unhealthy days based on the AQI (Air Quality Index) for a random sample of metropolitan areas is shown. Constructan 91% confidence interval based on the data. Assume the variable is normally distributed. Use a graphing calculator and round the answers to at least onedecimal place.40 50 14 21 5 3 15 6 23Send data to Excel<µ<XGol

Given91% confidence interval 40 50 14 21 5 3 15 6 23

Answered: Unhealthy Days in Cities The number of…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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In a study on running and happiness, runners indicated the number of miles they ran in a day and their subsequent score on a Happiness Survey (higher score = greater happiness). Runner # of miles (x) Happiness Score (y) 1 16 12 2 4 3 12 14 4 2 8 For these data: The mean of miles run is: 8.50 The mean of the Happiness scores is: 10.00 The standard deviation of the Miles scores is: 5.72 The standard deviation of the Happiness scores is: 3.16 In your submission, please include a copy of the SPSS or Excel output and answer the following: A. What is the r and r? value? B. Based on Pearson's r and r2 value, describe the relationship (direction/strength) that exists between # of miles run and Happiness scores. C. Create a scatterplot for the data using Excel or SPSS (include output in your submission). D. Insert the prediction line from Excel/SPSS on your scatterplot.
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Choose the appropriate statistical test. When computing, be sure to round each answer as indicated. A dentist wonders if depression affects ratings of tooth pain. In the general population, using a scale of 1-10 with higher values indicating more pain, the average pain rating for patients with toothaches is 6.8. A sample of 30 patients that show high levels of depression have an average pain rating of 7.1 (variance 0.8). What should the dentist determine? 1. Calculate the estimated standard error. (round to 3 decimals). [st.error] 2. What is thet-obtained? (round to 3 decimals). 3. What is the t-cv? (exact value) 4. What is your conclusion? Only type "Reject" or Retain"
A STATISTICS PROFESSOR IS REVIEWING GRADES TREAT THE SCHEDULE AS UNGROUPED DATA GRADE 86 76 96 86 92 82 74 76 85 81 88 GRADE 90 86 76 74 85 92 85 76 83 84 95 SOLVE FOR UNGROUPED DATA- MEASURES OF CENTRAL TENDENCY, QUARTILES. SAMPLE STANDARD DEVIATION RANGE INTERQUARTILE RANGE SOLVE BOTH WAYS
We wish to estimate what percent of adult residents in Ventura County like chocolate. Out of 500 adult residents sampled, 429 like chocolate. To construct a 99% confidence interval for the proportion (p) of adult residents who like chocolate in Ventura County, you need to use which one of the following calculator? Hypothesis Test for a Population Proportion Confidence Interval for a Population Mean Given Data Confidence Interval for a Population Mean Given Statistics Chi-Square Test for Independence Hypothesis Test for a Population Mean Given Data Two Dependent Sample Means Comparison Given Data Confidence Interval for a Population Proportion Hypothesis Test for a Population Mean Given Statistics One-Way ANOVA Two Independent Sample Means Comparison Given Statistics Two Independent Sample Means Comparison Given Data Two Independent Proportions Comparison Chi-Square Test for Goodness of Fit Enter your answer as an open-interval (i.e., parentheses) using decimals (not percents)…
Data set 18 includes "attractive" ratings of male dates by the female dates. The summary statistics are n=199, x-6.19, s-1.99. Use a 0.01 significance level to test the claim that the population mean of such ratings is less than 7 Find H, and H₁ for this claim. O Ho: mean>7, H1: mean-7 Ho: mean7 Ho: mean-7, H1: mean<7 2
You are interested in finding a 90% confidence interval for the average number of days of class that college students miss each year. The data below show the number of missed days for 13 randomly selected college students. Round answers to 3 decimal places where possible. 7 8 8 0 2 11 6 10 2 0 1 3 1 With 90% confidence the population mean number of days of class that college students miss is between and days.
A service data on the body mass index of 654 young women the mean body mass index in the sample was X bar equals 26.8 service data on the body mass index of 654 young women the mean body mass index. We treated these data as an SRS from a normal distribution population with a standard deviation of 7.5 A. given 3 confidence intervals for the mean BMI in the population using 90 95 and 99% confidence. B. What are the margins of air for 90, 95 and 99% confidence? how does increasing the confidence level change the margin of error of a confidence interval when the sample size and population standard deviation remain the same

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