A sample of 23 women athletes, aged 20 was taken. The systolic blood pressure of these women had an average of 112 with a standard deviation of 3.3. Calculate a 90% confidence interval for the average systolic blood pressure of 20-year old women athletes.

Step-by-step explanation:

average of 112 with a standard deviation of 3.3. Calculate a 90% confidence interval for the average systolic blood pressure of 20-year old women athletes.

From the above question

Number of samples = 23 , less than 30,

Hence, we find confidence interval using t score

Confidence Interval using t score =

Mean + t score × standard deviation/√n

Step 1

We find the degree of freedom

= N - 1

= 23 - 1

= 22

look a the sides they are perpendicular