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Jan 9, 2024
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4
Uploaded by AmbassadorElectron11827
10/16/23, 1:14 PM
Practice: Summarizing Associations
https://stat20.datahub.berkeley.edu/user/melaniehsiang/rstudio/p/fba52511/
1/4
mtcars
?mtcars
r
1 -0.8676594
m1 <-
lm
(mpg
~
wt,
data =
mtcars)
ggplot
(mtcars,
aes
(
x =
wt,
y =
mpg))
+
geom_point
()
+
labs
(
x =
"Weight (lbs)"
,
y =
"Fuel
summarize
(mtcars,
r =
cor
(wt, mpg))
10/16/23, 1:14 PM
Practice: Summarizing Associations
https://stat20.datahub.berkeley.edu/user/melaniehsiang/rstudio/p/fba52511/
2/4
r
1 -0.7761684
m1 <-
lm
(mpg
~
hp,
data =
mtcars)
ggplot
(mtcars,
aes
(
x =
hp,
y =
mpg))
+
geom_point
()
+
labs
(
x =
"Horsepower"
,
y =
"Fuel Ef
summarize
(mtcars,
r =
cor
(hp, mpg))
10/16/23, 1:14 PM
Practice: Summarizing Associations
https://stat20.datahub.berkeley.edu/user/melaniehsiang/rstudio/p/fba52511/
3/4
mpg wt
Mazda RX4 21.0 2.620
Mazda RX4 Wag 21.0 2.875
Datsun 710 22.8 2.320
Hornet 4 Drive 21.4 3.215
Hornet Sportabout 18.7 3.440
Valiant 18.1 3.460
Duster 360 14.3 3.570
Merc 240D 24.4 3.190
Merc 230 22.8 3.150
Merc 280 19.2 3.440
Merc 280C 17.8 3.440
Merc 450SE 16.4 4.070
Merc 450SL 17.3 3.730
Merc 450SLC 15.2 3.780
Cadillac Fleetwood 10.4 5.250
Lincoln Continental 10.4 5.424
Chrysler Imperial 14.7 5.345
Fiat 128 32.4 2.200
Honda Civic 30.4 1.615
Toyota Corolla 33.9 1.835
Toyota Corona 21.5 2.465
Dodge Challenger 15.5 3.520
AMC Javelin 15.2 3.435
Camaro Z28 13.3 3.840
Pontiac Firebird 19.2 3.845
Fiat X1-9 27.3 1.935
Porsche 914-2 26.0 2.140
Lotus Europa 30.4 1.513
mtcars
%>%
select
(mpg, wt)
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Practice: Summarizing Associations
https://stat20.datahub.berkeley.edu/user/melaniehsiang/rstudio/p/fba52511/
4/4
Ford Pantera L 15.8 3.170
Ferrari Dino 19.7 2.770
Maserati Bora 15.0 3.570
Volvo 142E 21.4 2.780
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- 8https://ezto.mheducation.com/ext/map/index.html?_con=con&external_browser=D0&launchUrl=https%253A%252F%252Fnet omework: Chapter 8 (Sections 8.1 through 8.5) G Saved 0 Calculate the standard error. May normality be assumed? (Round your answers to 4 decimal places.) Standard Error Normality (a) n 27, T = 0.32 %3D ts (b) n= 58, 7 = 0.45 n = 119 , TT = 0.39 Skipped (c) n 359, T = 0.004 (d) eBook Ask Print References Mc Graw Hillarrow_forward了 * 00 R Frequency cc.edu/webapps/assessment/take/launch.jsp?course_assessment_id=_842675_1&course_id%=_859154_1&content_id%3_19492605_1&step * Question Completion Status: QUESTION 1 The following histogram represents the number of body piercings for students in a statistics class. 40 0 2 4. 9 Number of Piercings 8 a. Is this graph symmetric or skewed? b. For this graph, is mean or median the best choice for the measure of center? c. For this graph, is standard deviation or IQR the best choice for the measure of variation? d. For this graph, the mean expected to be (higher than, lower than, or about the same as?) the median. QUESTION 2 Click Save and Submit to save and submit. Click Save All Answers to save all answers. Save 2 étv MacBook Air DD F7 F8 08 F 4 F5 F3 2$ 4 #3 9. 6. 5. |arrow_forwardThe maximum weights (in kilograms) for which one repetition of a half squat can be performed and the times (in seconds) to run a 10-meter sprint for 12 international soccer players are shown in the attached data table with a sample correlation coefficient r of -0.970. A 13th data point was added to the end of the data set for an international soccer player who can perform the half squat with a maximum of 205 kilograms and can sprint 10 meters in 2.01 seconds. Describe how this affects the correlation coefficient r. Use technology. Click the icon to view the data set. The new correlation coefficient r (Round to three decimal places a Data table Player 1 2 3 4567 8 9 10 11 12 13 going from 0.970 to gets stronger, gets weaker, stays the same, Maximum weight, x Time, y a 1.81 1.76 2.04 1.42 2.06 1.61 1.69 1.92 1.62 1.64 1.99 1.92 2.01 180 175 150 205 150 190 180 160 185 180 155 170 205arrow_forward
- cation.wiley.com/was/ui/v2/assessment-player/index.html?launchld%3Deef1e3c4-0de6-4778-8346-dec63c264926#/question/10 rk updated Question 11 of 16 - / 1 E View Policies Current Attempt in Progress Transgender Adults A study of transgender adults examines the age at which they began to transition and the age of their earliest memories of gender dysphoria. (In this exercise, we examine the age beginning transition and in Exercise 6.107 we examine the age of their earliest memories.) In the study of 210 transgender adults, the mean age at which they began transitioning was 32.6 with a standard deviation of 18.2. Find a 95% confidence interval for the mean age at which transgender adults begin transitioning. Zaliznyak M, Bresee C, and Garcia MM, "Age at First Experienceof Gender Dysphoria Among Transgender Adults Seeking Gender- Affirming Surgery," JAMA Network Open, March 16,2020. Some of the data has been approximated from informationin the paper. to Confidence interval (round to three…arrow_forwardThe maximum weights (in kilograms) for which one repetition of a half squat can be performed and the times (in seconds) to run a 10-meter sprint for 12 international soccer players are shown in the attached data table with a sample correlation coefficient r of -0.971. A 13th data point was added to the end of the data set for an international soccer player who can perform the half squat with a maximum of 210 kilograms and can sprint 10 meters in 2.01 seconds. Describe how this affects the correlation coefficient r. Use technology. Click the icon to view the data set. The new correlation coefficient r going from -0.971 to (Round to three decimal places a gets stronger, gets weaker, stays the same,arrow_forwardWrite up the results for the t-test, in APA format, and indicate if there is a significant difference in aggression of dementia patients when there is a full moon and when there isn't a full moon.arrow_forward
- zy Section 8.2- MAT 240: Applied S X O https://learn.zybooks.com/zybook/MAT-240-J4373-OL-TRAD-UG.22EWA/chapter/8/section/2?content_resource. prary > MAT 240: Applied Statistics home> Hypothesis test for the difference between two population proportions A Q ta E zyBooks catalog O Help/FAQ Lashon 387674.1891676.qany? Jump to level1 A state housing department is trying to determine if housing prices in county B are lower than in county A. The department decides torandormly sample recently sold houses in both counties and determine what proportion sold for more than $250,000. Since county A is considerably larger than county B, the housing department chose a larger sample from county A. The results of the data collected are shown below. County A County B Successes 665 Successes 340 Observations 900 Observations 500 p-hat_1 0.739 p-hat 2 0.68 Confidence level 99% p= Ex: 1.234: 2-Score 2.346 Pvalue 0.00939 -3 -1 -1 County A samples: 21 = Ex: 9 2 = Ex: 1.234, County B samples: n2 = Sample…arrow_forwardThe maximum weights (in kilograms) for which one repetition of a half squat can be performed and the times (in seconds) to run a 10-meter sprint for 12 international soccer players are shown in the attached data table with a sample correlation coefficient r of -0.941. A 13th data point was added to the end of the data set for an international soccer player who can perform the half squat with a maximum of 205 kilograms and can sprint 10 meters in 2.01 seconds. Describe how this affects the correlation coefficient r. Use technology. Click the icon to view the data set. The new correlation coefficient r (Round to three decimal places a going from 0.941 to - gets stronger, gets weaker, stays the same,arrow_forwardProduce a CROSSTAB for the variables DEGREE and MARHOMO. Before conducting the analyses, reverse code MARHOMO into R_MARHOMO so that 1 = Strongly Disagree; 2 = Disagree; 3 = Neither Agree nor Disagree; 4 = Agree; and 5 = Strongly Agree. Then, examine the relationship between these variables by testing both statistical significance and strength of association. Use chi-square for significance and choose the appropriate measures for strength of association (Phi, Cramer’s V, Lambda, or Gamma). Set alpha to .05. State the null and research hypotheses: H0: H1: What is the obtained chi-square value? What is the significance level (p-value) for the obtained chi-square? Should we reject or fail to reject the null hypothesis? Is there a statistically significant relationship between these variables? Which measure of association would be most appropriate for these variables? What is the value of the measure of association? Interpret your findings by explaining in full sentences whether there is a…arrow_forward
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