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he authors of the paper "Changes in Quantity, Spending, and Nutritional Characteristics of Adult, Adolescent and Child Urban Corner Store Purchases After an Environmental ntervention"t wondered if increasing the availability of healthy food options would also increase the amount people spend at the corner store. They collected data from a representative sample of 5,949 purchases at corner stores in Philadelphia after the stores increased their healthy food options. The sample mean amount spent for this sample of purchases was $2.86 and the sample standard deviation was $5.40.

he authors of the paper "Changes in Quantity, Spending, and Nutritional Characteristics of Adult, Adolescent and Child Urban Corner Store Purchases After an Environmental ntervention"t wondered if increasing the availability of healthy food options would also increase the amount people spend at the corner store. They collected data from a representative sample of 5,949 purchases at corner stores in Philadelphia after the stores increased their healthy food options. The sample mean amount spent for this sample of purchases was $2.86 and the sample standard deviation was $5.40.

MATLAB: An Introduction with Applications
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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For a) in the first sentence you choose between quite a bit of and very little For the second sentence in a) you choose between positively skewed, negatively skewed and approximately normal
he authors of the paper "Changes in Quantity, Spending, and Nutritional Characteristics of Adult, Adolescent and Child Urban Corner Store Purchases After an Environmental ntervention"t wondered if increasing the availability of healthy food options would also increase the amount people spend at the corner store. They collected data from a representative sample of 5,949 purchases at corner stores in Philadelphia after the stores increased their healthy food options. The sample mean amount spent for this sample of purchases was $2.86 and the sample standard deviation was $5.40. n USE SALT (a) Notice that for this sample, the sample standard deviation is greater than the sample mean. What does this tell you about the distribution of purchase amounts? The fact that the sample standard deviation is greater than the sample mean indicates that there is quite a bit of v variability in the distribution of purchase amounts. In addition, since purchase amounts cannot be negative, the larger standard deviation indicates that the distribution is ---Select--- (b) Before the stores increased the availability of healthy foods, the population mean total amount spent per purchase was thought to be about $2.81. Do the data from this study provide convincing evidence that the population mean amount spent per purchase is greater after the change to increase healthy food options? Carry out a hypothesis test with a significance level of 0.05. State the appropriate null and alternative hypotheses. O Ho: H > 2.81 H:H< 2.81 O Ho: H = 2.81 H:H< 2.81 O Ho: H < 2.81 H: H> 2.81 O Ho: H = 2.81 H: u = 2.81 O Ho: H = 2.81 H:H > 2.81 decimal places)
Transcribed Image Text:he authors of the paper "Changes in Quantity, Spending, and Nutritional Characteristics of Adult, Adolescent and Child Urban Corner Store Purchases After an Environmental ntervention"t wondered if increasing the availability of healthy food options would also increase the amount people spend at the corner store. They collected data from a representative sample of 5,949 purchases at corner stores in Philadelphia after the stores increased their healthy food options. The sample mean amount spent for this sample of purchases was $2.86 and the sample standard deviation was $5.40. n USE SALT (a) Notice that for this sample, the sample standard deviation is greater than the sample mean. What does this tell you about the distribution of purchase amounts? The fact that the sample standard deviation is greater than the sample mean indicates that there is quite a bit of v variability in the distribution of purchase amounts. In addition, since purchase amounts cannot be negative, the larger standard deviation indicates that the distribution is ---Select--- (b) Before the stores increased the availability of healthy foods, the population mean total amount spent per purchase was thought to be about $2.81. Do the data from this study provide convincing evidence that the population mean amount spent per purchase is greater after the change to increase healthy food options? Carry out a hypothesis test with a significance level of 0.05. State the appropriate null and alternative hypotheses. O Ho: H > 2.81 H:H< 2.81 O Ho: H = 2.81 H:H< 2.81 O Ho: H < 2.81 H: H> 2.81 O Ho: H = 2.81 H: u = 2.81 O Ho: H = 2.81 H:H > 2.81 decimal places)
Find the test statistic and P-value. (Round your test statistic to one decimal place and your P-value to three decimal places.) t = P-value = State the conclusion in the problem context. O We reject H. We have convincing evidence that the population mean amount spent per purchase is greater after the change to increased healthy food options. O We fail to reject H. We have convincing evidence that the population mean amount spent per purchase is greater after the change to increased healthy food options. O we reject H. We do not have convincing evidence that the population mean amount spent per purchase is greater after the change to increased healthy food options. O We fail to reject H. We do not have convincing evidence that the population mean amount spent per purchase is greater after the change to increased healthy food options. You may need to use the appropriate table in the appendix to answer this question.
Transcribed Image Text:Find the test statistic and P-value. (Round your test statistic to one decimal place and your P-value to three decimal places.) t = P-value = State the conclusion in the problem context. O We reject H. We have convincing evidence that the population mean amount spent per purchase is greater after the change to increased healthy food options. O We fail to reject H. We have convincing evidence that the population mean amount spent per purchase is greater after the change to increased healthy food options. O we reject H. We do not have convincing evidence that the population mean amount spent per purchase is greater after the change to increased healthy food options. O We fail to reject H. We do not have convincing evidence that the population mean amount spent per purchase is greater after the change to increased healthy food options. You may need to use the appropriate table in the appendix to answer this question.
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