The students in an Introductory Statistics class are asked to complete a survey about study habits. (a) does the study appear to use random sampling? yes or no (b) does the study appear to use random assignment? yes or no

Scenario:  An early childhood education student is undertaking an observational study of literacy development among kindergardeners in Rancho Cordova. The school she is placed at has 230 students in 12 classrooms Short Answer A. Describe a way she can take a stratified sample. B. Describe what the explanatory and response variables may be. C.A convenience sample is taken and introduces nonrandom sampling error. What is one way this can happen?

BESTION 12 the study description below to answer the following questions. A research group is interested in the relationship between alcohol consumption and heart disease in American men over the age of 40 years old. The researchers randomly selected 1913 medical records of men who suffer from heart disease. The researchers reco did not drink, drank moderately, or drank heavily. They found that men who had heart disease tended to drink heavily. Identify the population for the study. Identify the sample for the study. or the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). C Paragraph Arial 10pt T V 10 1 T == al || 15 15 №² Y

Micah is interested in testing whether college students' levels of gratitude change over the course of the semester. He randomly selects a sample of 100 students and assesses their levels of gratitude at the beginning, and end of the semester.   Question 17 options:   ANOVA   Paired samples t test   Independent samples t test   Correlation

A 2016 episode of the NPR program "This American Life" featured a radio show host from Tigerville South Carolina and focused on the divisions among evangelical Christians regarding their support of the then-presidential candidate Donald Trump. We know that these divisions still exist, and suppose you want to survey the people of Tigerville (population: 1.312) to see how many of them support Donald Trump today, and you want to use a simple random sample. (a) An SRS of 150 people is taken and it turns out that 55 support Trump. Estimate the proportion of people in Tigerville that support Trump and give a 95% confidence interval for the true proportion of Trump supporters using your estimate. (b) If 100 simple random samples are taken independently, and 100 such 95% confidence intervals are constructed, what is the probability that all 100 of these intervals will cover the true proportion? Does this number make sense to you? Explain.

Compare and contrast (a.) single-sample t tests, (b.) paired sample t tests, and (c.) independent sample ttests in terms of participants recruited, data collected from each participant, and information we need toconduct the analysis.

(6) A student surveys some students on campus in the evening and finds that 16 out of 20 of the students she interviewed are part time students. She uses the data to estimate the percentage of all students who are part time. What type of bias is present in her sample?