When 5 points are added to everybody\'s test score, which statistics change? the

Question

When 5 points are added to everybody's test score, which statistics change? the mean of the test scores the standard deviation of the these scores the median test scores l and ll l and lll lland lII ll only None change The people on the ship Titanic were classified saw class, second class, third class, or crew. Records were kept so that we know how many people were in each group as well as the ages of each passenger. Use this information to answer the next two questions. Suppose we wanted to display the ages of the passengers so that it is easy to see the average age as well as the spread of the ages of the passengers. Which display would be most appropriate for showing this? A histogram A pie chart Scatterplot A Boxplot A swimmer at UMW swam in her team's time trial meet. She swam a time of 24.4 seconds in her 50-yard freestyle time tram, and a time of 29.7 seconds in her 50-years backstroke time trial. For the team, overall, the freestyle times had a mean of 25.6 seconds and a standard deviation of 0.7 seconds. while the mean for the backstroke was 30.6 seconds and the standard deviation was seconds. In which event, did she swim faster compared to her teammates? Freestyle Backstroke It's a tie Which of the following correlation values indicates the weakest linear relationship between two quantitative variables? r = -0.65 r = - 0.30 r = 0.98 r = 0.51

Explanation / Answer

5) as 5 point added ; hence mean will increase by points too, also median is a value which increases by 5 points hence it should increase. As std deviation is square of difference b/w mean and value, which both has increased hence it will have no effect on std deviation

thereofre option B is correct

6) a box plot will suit this,

7)as z score =(X-mean)/std deviation

hence for freestyple z score =(24.4-25.6)/0.7=-1.71

and for backstroke z score =(29.7-30.6)/0.5=-1.8

hence z score in freestyle is better. therefore it is freestyle

8)r=-0.14 as it has minimum absolute value

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