A psychologist conducted a survey of the attitude towards the sustainability of American energy consumption with 250250 randomly selected individuals several years ago. The psychologist believes that these attitudes have changed over time. To test this he randomly selects 250250 individuals and asks them the same questions. Can the psychologist confirm his theory that the attitudes have changed from the first survey to the second survey? Attitude 1st Survey 2nd Survey Optimistic 50%50% 52%52% Slightly Optimistic 16%16% 10%10% Slightly Pessimistic 11%11% 15%15% Pessimistic 23%23% 23%23% Copy Data Step 6 of 10 :   Find the value of the test statistic. Round your answer to three decimal places. Step 7 of 10: Find the degrees of freedom associated with the test statistic for this problem Step 8 of 10: Find the critical value of the test at the 0.025 level of significance. Round your answer to three decimal places. step 9 of 10: make the decision to reject or fail to reject the null hypothesis at 0.005 level of significance.

Coffee and Depression: Researchers conducted a study investigating the relationship between caffeinated coffee consumption and risk of depression in women. They collected data on 50,739 women free of depression symptoms at the start of the study in the year 1996, and these women were followed through 2006. The researchers used questionnaires to collect data on caffeinated coffee consumption, asked each individual about physician-diagnosed depression, and also asked about the use of antidepressants. The table below shows the distribution of incidences of depression by amount of caffeinated coffee consumption. (M. Lucas et al, 2011). Tip: Do NOT include the TOTAL row and column in your table when you copy into your technology application such as Statcrunch or a Calculator. ≤ 1 cup/week 2-6 cups/week 1 cup/day 2-3 cups/day ≥ 4 cups/day Total 373 905 564 95 2607 Clinical Depression: Yes 670 Clinical Depression: No 11545 6244 16329 11726 2288 48132 Total 12215 6617 17234 12290 2383 50739

A student was given three scenarios for different pairs of variables. The student was asked to determine the type of relationship between the two variables in each scenario based on their corresponding correlation coefficient. The student's answers are shown in the following table. Scenario Student's Answer Weak/no relationship between the variables Strong relationship between the variables 1. Two variables with correlation coefficient 0.01 2. Two variables with correlation coefficient 0.75 3. Two variables with correlation coefficient -0.80 Weak/no relationship between the variables The student's answers provide evidence of which of the following misconceptions? Select ALL that apply. A negative correlation always indicates a weak relationship or no relationship. If the correlation is greater than 0, the correlation is strong. The higher the absolute value of correlation, the weaker the relationship.

You watch people exiting Dodgers stadium after a game and you write down two things about each person: (1) How many pieces of blue "Dodgers" clothing they are wearing, and how sad they look (on a scale of 1-10) that the Dodgers just lost. You are curious about whether there is a relationship between these two variables, and also whether you can use the number of pieces of "Dodgers" clothing that a person wears to a game to predict how sad they will be if the Dodgers lose. What kind of hypothesis test would allow you to do this? Chi-Square Goodness of Fit O One-Factor, Independent-Measures ANOVA Two-Factor ANOVA O Correlation/Regression

A psychologist conducted a survey of the attitude towards the sustainability of American energy consumption with 380380 randomly selected individuals several years ago. The psychologist believes that these attitudes have changed over time. To test this he randomly selects 380380 individuals and asks them the same questions. Can the psychologist confirm his theory that the attitudes have changed from the first survey to the second survey? Attitude 1st Survey 2nd Survey Optimistic 6%6% 7%7% Slightly Optimistic 30%30% 26%26% Slightly Pessimistic 21%21% 24%24% Pessimistic 43%43% 43%43% Copy Data Step 4 of 10 :   Find the expected value for the number of respondents who are optimistic. Round your answer to two decimal places.

A researcher would like to know if stress has a negative effect on memory performance. One group of participants was exposed to a stress inducing noise and the second group listened to a calming music. Afterwards, both groups were given a memory test. The researcher compared the average memory test scores of two groups. What is the dependent variable in this experiment? Stress inducing noise. O Stress reducing calming music. O Level of stress (i.e., stress inducing noise or calming music) Memory test performance.

QUESTION 2 Researchers conducted two surveys about teens are their use of social media. The first survey asked a random sample of 800 U.S. teens about their use of Instagram. A second survey asked the same questions to a random sample of 2253 Canadian teens. In these two studies, 73% of U.S. teens and 88% of Canadian teens said that they use Instagram. Use these results to answer the following questions about the proportion of U.S. and Canadian teens that use Instagram. (Round to the nearest whole hundredth as needed). What is the difference between the proportion of U.S. teens and the proportion of Canadian teens? The standard error for these two samples is and the upper limit is Using a 99% confidence level, the lower limit is

Olivia sees that in her data there is a relationship between regular exercise and a range of health outcomes, with those doing exercise having better outcomes. Olivia can claim which of the following statements A. there is evidence of a correlation between regular exercise and health outcomes in her group of UTS academics B. there is evidence of a causal relationship between regular exercise and health outcomes in the population of UTS academics C. there is evidence of a causal relationship between regular exercise and health outcomes in her group of UTS academics D. there is evidence of a correlation between regular exercise health outcomes in the population of UTS academics O She can claim only statement A O She can claim only statement C She can claim all statements O She can claim statements A and C O She can claim statements A and D She can claim statements B and C

A study was done to look at the relationship between number of lovers college students have had in their lifetimes and their GPAs. The results of the survey are shown below.   Lovers 2 1 4 3 0 7 1 4 7 GPA 3.5 3.5 2.6 3.5 3.2 1.7 3.1 2.8 2 Use the model to predict the GPA of a college student who as had 2 lovers.GPA = (Please round your answer to one decimal place.)

A CBS News poll conducted June 10 and 11, 2006, among a nationwide random sarmple of 651 adults, asked those adults about their party affiliation (Democrat, Republican or none) and their opinion of how the US economy was changing ("getting better," getting worse" or "about the same"). The results are shown in the table below.