CLASS ASSIGNMENT #5 12 Points

KEY STAT 101 NAME: ______

CLASS ASSIGNMENT #5 [12 points]:

GENERAL INSTUCTIONS:  COMPLETE YOUR ASSIGNED PROBLEMS ON THIS SHEET. TRACE METALS  THIS ASSIGNMENT IS DUE AT CLASS TIME THURSDAY. Location Bottom Surface  Please be thorough and neat in the presentation of your responses as they must fit within the 1 0.43 0.415 space provided on this sheet. 2 0.266 0.238  Grading: Problem point values and point credit distributions are included in brackets [ ]. 3 0.567 0.39 General Grading: -.5 for first error; -1 to -2 for multiple errors; 0 minimal effort/not 4 0.531 0.41 attempted/incorrect. 5 0.707 0.605 6 0.716 0.609 ASSIGNED PROBLEM: Trace Metals, Infant Mortality, or Saliva Cotinine Levels CA#5 Trace Metals CA#5 Infant Mortality TRACECA#5 Cotinine Levels INFANT MORTALITY Saliva Cotinine Levels 8:30AM 10AM 2:30PM 8:30AM 10AM 2:30PM 8:30AM 10AM 2:30PM Blau Baker Andersen Dolan Cole HarringtonMETALS:Godinez Anderson TraceGiganti Country Calories Infant_Deaths Subject After 12 hr. After 24 hr. Carton Blatchly Conway Finnerty Cruz Orlik metalsKraus inDuran the Gomez 1 73 24 Coney Canestrari DiBartolomeoFreshour Davaros Possidel McLean Godden Hunter Argentina 2730 98.8 Iasparo Chung Jeong LeFevre Dino Reiley drinkingSantos Laventure waterJeffrey Australia 3300 39.1 2 58 27 King Costello Jewett MonteleoneFrayer Reyes Sousie Manteria Katsoff 3 67 49 Liebold Farrell Milana O'Sullivan Gerringer Rivera, AaffectStevens theMcfall flavorKehoe of Austria 2990 87.4 4 93 59 Oliver Goczan Moscatello Piper Hay Sander theVerdone water,Reisert and Li Belgium 3000 83.1 Quintana Haskell Muller Wynne Janowitz Smith Wetzel Rogers Pagan 5 33 0 unusuallySchlottman Heaton highPirro concentrationsWare McHale canStearns pose a healthSternberg hazard.Pedersen Burma 1080 202.1 The accompanyingSchwark Rivera, J table showsPecci traceSundick metal concentrationsWeinbergerSevering 6 18 11 Weiss Rogers Weafer Viola Canada 3070 67.4 7 147 49 (zinc, in mg/L) for both surface water and bottom water at six different river locations. Our aim is to see if surface water concentrations (X) are predictive of bottom water concentrations (Y).

INFANT MORTALITY: The accompanying table gives the net food supply (X, number of calories per person per day) and the infant mortality rate (Y, number of infant deaths per 1,000 live births) for certain selected countries before World War II.

SALIVA COTININE LEVELS: In a study of saliva cotinine, seven subject, all of whom had abstained from smoking for a week, were asked to smoke a single cigarette. The cotinine levels at 12 and 24 hours after smoking are provided.

ASSIGNMENT: Using the data provided for your problem complete the following:

1) Assume it makes sense to study a relationship between these two variables… mostly because it does.

2) [2] Make a scatter plot of these variables.

3) 3) 3) 3) 3) [2] State in words the null and alternative correlation hypotheses to be tested.

There is no linear relationship between _____ and _____

There is a linear relationship between _____ and _____

4) [3] Calculate the correlation for the two variables. r = ______Trace: KEY

Infants

Cotinine

5) [1] Determine if the correlation is statistically significant: not sig.  = .05  = .01 (Use: Critical Values for the Pearson’s Correlation Coefficient Table; text page A26) Trace:  = .01; Infant:  = .01; Cotinine:  = .05; 6) [3] Determine the regression equation for these data:

Trace Metals Infant Mortality

nxy  (x)(y) .686523 nxy  (x)(y) 1337247 b1   1.138586 b    .06762 n(x2 )  (x)2 .602961 1 n(x2 )  (x)2 19776900

b0  y  b1 x  .5361667  (1.138586)(.4445)  .0300653 b0  y  b1 x  96.31.67  (.06762)(2695)  278.5526  y  .0300653  (1.138586 )( x)  y  278 .5526  (.06762 )( x) whenx = .470 mg/L when x = 2240 cal:   y  .5652007 mg / L) y  127.0838 deaths /1000 _ live _ births

Cotinine Levels nxy  (x)(y) 29332 b    .391877 1 n(x 2 )  (x)2 74850 7) [1] Answer the item pertaining to your data set.

Place answer here: b0  y  b1 x  31.29  (.391877)(69.86)  3.913473  For Trace Metals: Determine the estimated Bottom Water y  3.91  (.391877 )( x) Concentration where a Surface Water Concentration of zinc was .470 mg/L. When x = 69.86 mmol/L: For Infant Mortality: Determine the estimated Infant Mortality fory Chile, 31 which.2865 hadmmol a calorie/ Lper person value of 2240 calories.

For Saliva Cotinine Levels: Determine the estimated Cotinine level at 24 hours when the 12 hour value was 69.86 (mmol/L). (data: Le p. 306)