Find a 90% confidence interval estimate of the mean weight of all women based on a sample of 35 women with a mean sample weight of 150.27. the standard deviation of all women is known to be 30.87. write your answer in interval form, using values rounded to two decimals.

Answer-

The 90% confidence interval of the sample is (140.04,160.5).

Solution-

Assuming it as normal distribution,

Number of observations n = 35

Mean = X = 150.27

Standard Deviation = s = 30.87

Then Confidence Interval we want: 95%, Then the Z value for that Confidence Interval is Z = 1.960

Using that Z in this formula for the Confidence Interval,

Putting all the values,

b

step-by-step explanation:

the total is 23.97. 0.25% is off so you have to subtracting 25% from 100% and you will get 75% if you convert it to decimal you will get 0.75. you have to find the original because the formula is % times original = total.so you have the total and the % so you just have to plug it in.