Question

QUESTION 1 10 points Save Answer The blood pressure (average of systolic and diastolic measurements) of each of 20 randomly selected persons was measured. The results were: 30, 38, 51, 32, 50, 23, 37, 24, 21, 67, 45, 47, 34, 36, 32, 29, 49, 55, 65, 41 Can we assume normality for this sample? (Hint: You can use qqnorm and qqline or the CLT to help answer this question) Yes Ο Νο QUESTION 2 10 points Save Answer The blood pressure (average of systolic and diastolic measurements) of each of 20 randomly selected persons was measured. The results were: 30, 38, 51, 32, 50, 23, 37, 24, 21, 67, 45, 47, 34, 36, 32, 29, 49, 55, 65, 41 Construct a 95% confidence interval for the true mean blood pressure. What is the lower bound? (Round to three decimal places)

Answer 1

Question 1.

Using Minitab:

To create a QQ-plot (quantile-quantile or normal probability plot),

select Graph > Probability Plot, choose "Simple," and move "Data" into the "Graph variables" box.

Minitab - Untitled - [Worksheet 1* File Edit Data Calc Stat Graph Editor Iools Window Help Assistant TOO C1 Probability Plot: Single X Data Data C1 Graph variables: 30 1 Datal 38 2 51 32 50 5 23 Distribution... Scale... Labels... 37 7 24 8 Multiple Graphs.. Data Options... 21 9 67 10 Select 45 11 47 12 Help Cancel OK 34 13 36 14 32 15 29 16 49 17 55 18 65 19 41 20 Ln LO

Click OK you we get plot.

Probability Plot of Data Normal 95% CI 99 Mean 40.3 13.13 StDey N 20 95 AD 0.276 P-Value 0.617 90 80 70 60 50 40 30 20 10 5 1 10 30 40 50 60 70 80 90 Data Percent 20

The plotted points roughly forming a straight line close to the fitted line. So We can assume normality for this sample.

Please post the other questions separately. As per our answering guidelines, we are supposed to answer just one question or four sub parts of the same question.
Hope this will be helpful. Thanks and God Bless You:)