In a National Institute on Alcohol Abuse and Alcoholism survey, 33% of American adults said that they had never consumed alcohol. Suppose that this result is true for the 2019 population of American adults. In a recent random sample of 2300 adult Americans, 35% said that they had never consumed alcohol. Test the hypothesis that the current percentage of American adults who have never consumed alcohol is different from 33%. What is the test statistic? 0.9793 0.35 2.04 0.0414 0.0207

A researcher groups college student in a study based on their year in college (freshman, sophomore, junior, senior) and the type of college they attend (junior, technical, university). He concludes that perceptions of academic cheating are more positive among freshman attending junior college. To reach this conclusion, which statistical test would need to be computed?

If a researcher failed to use a random sample, how would this affect the research conclusion?   If a researcher failed to use random assignment, how would this affect the research results?

The Excel file Room Inspection provides data for 100 room inspections at 25 hotels in a major chain. Management would like the proportion of nonconforming rooms to be less than 2%. Test an appropriate hypothesis to determine if management can make this claim.

In a survey of 1220 adults in a​ country, 58​% said the​ country's leader should release all medical information that might affect their ability to serve. The study is   observational, an experiment, because it   applies does not apply a treatment to the adults.

A nationwide job recruiting firm wants to compare the annual incomes for childcare workers in New York and Illinois. Due to recent trends in the childcare industry, the firm suspects that the that the mean annual income of childcare workers in the state of New York is greater than the mean annual income of childcare workers in Illinois. To see if this is true, the firm selected a random sample of  20  childcare workers from New York and an independent random sample of  20  childcare workers from Illinois and asked them to report their mean annual income. The data obtained were as follows.   Annual income in dollars New York 46686 ,  34979 ,  47325 ,  48892 ,  51128 ,  56792 ,  47785 ,  48995 ,  57301 ,  55176 ,  48002 ,  45718 ,  50351 ,  58527 ,  47067 ,  53699 ,  54361 ,  49727 ,  36426 ,  50870 Illinois 48009 ,  46871 ,  42774 ,  49790 ,  43163 ,  45401 ,  41068 ,  50300 ,  47064 ,  42003 ,  47775 ,  41917…

Anterior cruciate ligament (ACL) injuries occur most frequently in planting and cutting sports such as basketball, soccer, and volleyball.  A sports medicine researcher wants to test if female athletes are more likely to have an ACL injury than males.  He surveyed 50 collegiate programs that had both men’s and woman’s volleyball and asked them how many grade 3 ACL tears they had during the past season.  Which statistical test would be best to determine if there is a significant difference between groups?

A question in a poll taken in 2007 asked, "Do you think the penalties for underage drinking should be made more strict, less strict, or remain the same?" The sample proportion that responded "more strict" was 0.61 (61%). This result will be used to estimate the proportion of all adults in the United States who think that penalties for underage drinking should be more strict. The sample consisted of n = 500 randomly selected adults in the United States Calculate a 95% confidence interval that estimates the population proportion who think that penalties for underage drinking should be more strict. (Round your answers to three decimal places.)

How does an observed sample mean qualify as a common outcome?

The Bureau of Labor Statistics reports that the official unemployment rate for Black people was 10.4% and 4.7% for White people in February 2015. Select all correct answers for this question. O The samples of white and black people are independent. The explanatory variable is the unemployment rate. The response variable is the unemployment rate. The response variable is race.