A researcher is interested in studying how the number of books parents read to their children can influence a child's reading skills in kindergarten. She randomly assigns families with 5 year old children to either read their child 3 books per day, 2 book per day, or 1 book per day for the first 2 months of kindergarten. They then measure the children's reading ability.    How could the confound be fixed for this scenario? B

A 2017 study of over half a million eighth through 12th graders found that the number exhibiting high levels of depressive symptoms increased by 33 percent between 2010 and 2015. (a) What is the population of this study? (b) What is the sample of this study?   Be clear to mark part (a) and (b) in your solution.

I want to run an additional post hoc test to compare the stats knowledge of first year psychology majors before taking the course, with their knowledge after taking the course (to see if I successfully taught them). What post-hoc test would be appropriate? Explain your reasoning.

Amit Almor, a psychology researcher at the University of South Carolina, conducted a series of experiments on conversation and attention level. He found that subjects were four times more distracted while preparing to speak or speaking than when they were listening. This research has many implications, including those for the issue of using cell phones while driving. You decide to explore this issue by having three different groups try tracking a fast-moving target on a computer screen. The first group is preparing to speak, the second group is speaking, and the third group is listening to a conversation. The sample mean and sum of squares of the scores for each of the three groups are presented in the following table. Group Sample Mean Sum of Squares Preparing to speak 98.3 7,2810.0900 Speaking 101.5 6,6156.8100 Listening 103.2 70,277.7600   After collecting the data, you analyze the data using an ANOVA. The results of your analysis are presented in the following…

One study found a positive correlation between years of education and yearly income. Which fact would lead you to believe that the relationship between years of education and yearly income is one of causation and not correlation?

New research on the effects of social media usage has been mixed. Some studies have found that social media helps people stay connected to others, and can be a positive source of social support. Other studies have found that social media makes people feel lonely and unhappy. I decide to do my own study to see whether social media has an effect on how many close friends people have. I conduct an internet survey of 1000 people and ask them how many hours a week they spend on social media and how many close friends they have. In the study respondents spent 10 hours a week using social media, and had 4 close friends, on average. The standard deviations for social media usage and close friends were 4 hours and 2 friends, respectively.  The correlation (r) between social media and friends was -.3.

The design of controls and instruments affects how easily people can use them. Timothy Sturm investigated this effect in a course project, asking 25 right‑handed students to turn a knob (with their right hands) that moved an indicator by screw action. There were two identical instruments: one with a right‑hand thread (the knob turns clockwise) and the other with a left‑hand thread (the knob turns counterclockwise). The table gives the times, in seconds, each subject took to move the indicator a fixed distance. Performance times (seconds) using right‑hand and left‑hand threads Subject Right Thread Left Thread 1 113 137 2 105 105 3 130 133 4 101 108 5 138 115 6 118 170 7 87 103 8 116 145 9 75 78 10 96 107 11 122 84 12 103 148 13 116 147 Performance times (seconds) using right‑hand and left‑hand threads Subject Right Thread Left Thread 14 107 87 15 118 166 16 103 146 17 111 123 18 104 135 19 111 112 20 89 93 21 78 76 22 100 116 23 89…

Can you answer #1 and #2 please

You want to study whether music affects people’s ability to learn.  You get a sample of college students.  First, you have them study a list of words with soft classical music playing, then you test how many words they correctly remember.  Second, you have them study a list of words with loud heavy metal playing, then you test how many words they correctly remember.  You want to compare their learning/memory with the classical music to their learning/memory with the loud heavy metal music.  What kind of hypothesis test should you do? Independent-Samples t-test Related-Samples t-test One-Sample t-test One-Sample z-test

You wish to determine the impact expressive writing has on days spent in the hospital for elderly adults. However, it is difficult to estimate the population average of days spent in the hospital. Thus, we recruit 14 elderly adults and randomly assigned half to either write expressively about their most traumatic life event or to write about their plans for that day- both groups write 20-minute essays four days in a row and six months later are asked how many days they have spent in the hospital. Expressive writing condition: 2, 5, 1, 4, 4, 2, 3 Control condition: 8, 8, 5, 2, 7, 5, 7 Which statistical test would you select: Ho: H₁: Enter the data above into and JAMOVI and use the correct statistical procedure to test the null hypothesis - answer the following questions: What is the mean difference between the two samples? What is the standard error of the mean? What is the appropriate 95% CI? [ What is the d-effect size? What is the t-observed? } Based on the p-value (a = .05) should…