A survey was conducted where 27 students were asked which social media app is their favorite, Twitter or Tiktok.    male female twitter 4 4 TikTok 4 15   Describe the marginal distributions Based on your display and the conditional distributions, are your variable independent or not independent? Explain.

What effect does an outlier have on a correlation coefficient? Would it increase, decrease or stay the same?

Major League Baseball (MLB) consists of 30 The earned run average, ERA, is a statistic used to measure a pitcher's (the person who throws the ball to the person trying to hit the ball) effectiveness. The lower the ERA, the more effective the pitcher is. Statisticians are trying to show there is a correlation between the team’s ERA and the number of wins. The data on the spreadsheet is from all the teams in the 2021 regular season. Find the equation for the regression line for this data. Find the correlation coefficient and R2. State the Null and Alternate Hypothesis. State Decision Rule and Critical Value at the 5% significance level (think about whether this should be a one or two tailed test and which test statistic needs to be calculated). Compute the test statistic and p-value. What is your decision concerning Null? What does that mean? If the ERA were 4.5, what is the predicted number of wins (ŷ) using the regression line?     ERA to wins in 2021 (n = 30)…

A recent study revealed that the average weight of babies born in the United States is normally distributed with a mean of 7.5 pounds. This number is lower than recent years and so researchers are interested in determining what factors are associated with lower birth weights. One researcher decides to look at the age of the mother to determine if younger mothers have babies that are significantly heavier or lighter than average. To study this the researcher collects data from 87 babies who were born to mothers between the ages of 16 and 18. Only one baby was measured per mother. Twins and other multiple births were excluded. The average weight for these babies was 7.3 pounds with a standard deviation of .6 pounds. Was the average weight of babies of young mothers significantly different than babies in the general population?     No, the difference was not significant     Yes, they were lighter.     Yes, they were heavier

You believe that adults become more creative as they get older, based off a moderately positive correlation between age and creativity found on among a university freshman sample - what is the most striking problem with trying to measure correlation with this description? (outliers, restriction of range, nonlinear relation, inferring causation)

An investigator has determined that the correlation between measures of anxiety and depression is -0.65. What kind of relationship is this? Positive Negative Invalid data Nonlinear