MATH 221 (MATH221)

9- Describing Residuals: Describe from the textbook as listed in graphics- what does it mean, if anything if residuals are small? 6. What graphic depiction would most effectively help a researcher compare the distribution of the hours spent online among teenagers, young adults, and the elderly and why? 10. Ethics: If the computer gives you the slope and intercept for a regression equation, does that mean that the two variables have a strong relationship? Why or why not? Show Less

(CO 6) The coefficient of determination is represented by what notation? β ρ Correct! r2 r See text page 499 (CO 6) Two variables have a positive linear correlation. Does the independent variable increase or decrease as the dependent variable increases? Correct Answer Independent variable increases Independent variable decreases Independent variable would remain the same Cannot determine from information given (CO 6) Find the regression equation for the following data set x 245 187 198 189 176...

A random sample of 100 medical school applicants at a university has a mean total score of 502 on the MCAT. According to a report, the mean total score for the school’s applicants is more than 499. Assume the population standard deviation is 10.6. At α = 0.01, is there enough evidence to support the report’s claim? (Source: Association of American Medical Colleges) What if the claim and state H0 and Ha. Uncover the standardized test statistic z or t OR find the corresponding P-value. Correc...

Statistical Concepts: Confidence Intervals Data Simulation Normal Probabilities Short Answer Writing Assignment All answers should be complete sentences. We need to find the confidence int erval for the SLEEP variable. To do this, we need to find the mean and standard deviation with the Week 1 spreadsheet. Then we can the Week 5 spreadsheet to find the confidence interval. First, find the mean and standard deviation by copying the SLEEP variable and pasting it into the Week 1 spreadsheet. Write ...

Joseph and Kandy when we develop a confidence interval (CI) we are computing a range of values that’s likely to include a population value with a certain degree of confidence. It is an interval that tells us that the population means lies between an upper and lower interval. What are commonly … confidence intervals? (Responses to the question above) Show Less

Question: Let x represent the number of cars in a parking lot. This would … what type of variable: Question: Let x represent the height of corn in Oklahoma. This would … what type of variable: Question: If you created the probability distribution for these data, what would … the probability of 40-49? Question: Consider the following table. Find the mean of this variable. Question: Consider the following table. Find the variance of this variable. Question: Consider the following table....

MATH 221 Week 5 Quiz (v3) Question: (CO 3) Consider the following table. If you … the probability distribution for these data, what would … the probability of 30-39? Question: (CO 3) Consider th e following table of hours worked by part-time employees. These employees must work in 5-hour blocks. Find the mean of this variable. Question: (CO 3) Consider the following table. Find the variance of this variable. Question: (CO 3) Consider the following table. Find the standard deviation of this v...

Question: (CO 3) Consider the following table. If you … the probability distribution for these data, what would … the probability of 40-49? Question: (CO 3) Consider the following table of hours worked by part-time employees. These employees must work in 5-hour blocks. Find the mean of this variable. Question: (CO 3) Consider the following table. Find the variance of this variable. Question: (CO 3) Consider the following table. Find the standard deviation of this variable. Question: (CO 3) F...

MATH 221 Week 5 Quiz (v1) Question: (CO 3) Consider the following table. If you … the probability distribution for these data, what would … the probability of 60-69? Question: (CO 3) Consider th e following table of hours worked by part-time employees. These employees must work in 5-hour blocks. Find the mean of this variable. Question: (CO 3) Consider the following table. Find the variance of this variable. Question: (CO 3) Consider the following table. Find the standard deviation of this v...