The assessment of diet is an important exposure for many disease outcomes. However, there is often much imprecision in dietary recall. In one study, 70- to 79-year-old women were asked about the preschool diet of their children (ages 2-4) using a food frequency questionnaire (FFQ). A unique aspect of the study is that simultaneous diet record data exist on the same children recorded in real time by their mothers when they were ages 2-4 and their mothers were 20 to 40 years old. The data in the table below were available on average servings of margarine per week. Margarine Intake Assessed by Two Different Recording Methods (Servings per Week, [n = 12]) ID 340 H₂: 399 466 502 541 554 558 605 611 618 653 707 FFQ 7 7 0 0 0 7 7 7 21 0 21 7 DR 0 0.5 0 0 0 2.4 3.1 0.5 3.6 2.3 4.2 8.6 The Pearson correlation between intake from the two recording methods was 0.4500. Assume that FFQ and DR margarine intake are normally distributed. You can use the Distribution Calculators page in SALT to find critical values and/or p-values to answer parts of this question. (a) Test the hypothesis that the true Pearson correlation (p) is significantly different from zero [provide a p-value (two-tailed)]. (Use a = 0.05.) State the null and alternative hypotheses. (Enter != for as needed.) Ho: Calculate the test statistic. (Round your answer to two decimal places.) Use technology to find the p-value. (Round your answer to four decimal places.) p-value=
The assessment of diet is an important exposure for many disease outcomes. However, there is often much imprecision in dietary recall. In one study, 70- to 79-year-old women were asked about the preschool diet of their children (ages 2-4) using a food frequency questionnaire (FFQ). A unique aspect of the study is that simultaneous diet record data exist on the same children recorded in real time by their mothers when they were ages 2-4 and their mothers were 20 to 40 years old. The data in the table below were available on average servings of margarine per week. Margarine Intake Assessed by Two Different Recording Methods (Servings per Week, [n = 12]) ID 340 H₂: 399 466 502 541 554 558 605 611 618 653 707 FFQ 7 7 0 0 0 7 7 7 21 0 21 7 DR 0 0.5 0 0 0 2.4 3.1 0.5 3.6 2.3 4.2 8.6 The Pearson correlation between intake from the two recording methods was 0.4500. Assume that FFQ and DR margarine intake are normally distributed. You can use the Distribution Calculators page in SALT to find critical values and/or p-values to answer parts of this question. (a) Test the hypothesis that the true Pearson correlation (p) is significantly different from zero [provide a p-value (two-tailed)]. (Use a = 0.05.) State the null and alternative hypotheses. (Enter != for as needed.) Ho: Calculate the test statistic. (Round your answer to two decimal places.) Use technology to find the p-value. (Round your answer to four decimal places.) p-value=
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.6: Summarizing Categorical Data
Problem 10CYU
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