Listed below are speeds (mi/h) measured from southbound traffic on i-280 near cupertino, california (based on data from sigalert). this simple random sample was obtained at 3: 30 pm on a weekday. use the sample data to construct a 95% confidence interval estimate of the population standard deviation. 62 61 61 57 61 54 59 58 59 69 60 67a.) 4.7 mi/h< < 5.6 mi/h

b.) 2.9 mi/h< < 6.9 mi/h

c.) 3.1 mi/h< < 8.5 mi/h

d.) 1.6 mi/h< < 4.9 mi/h

e.) 5.4 mi/h< < 9.2 mi/h

Option (B) is the correct answer to the following question.

Step-by-step explanation:

Step-1: We have to find the Mean of the series.

The series is Given in the question 62 61 61 57 61 54 59 58 59 69 60 67.

Step-2: We have to find the Standard Deviation.

Let Standard Deviation be x.

Formula of Standard Deviation is:

Put value in formula of Standard Deviation,

= 40.75

Step-3: Then, we have to find the critical value by chi-square.

Then, find the confidence interval which is 95%.

correct answers below: