Arandom sample of 60 suspension helmets used by motorcycle riders and automobile race-car drivers was subjected to an impact test, and on 16 of these helmets some damage was observed. (a) find a 95% two-sided confidence interval on the true proportion of helmets of this type that would show damage from this test. round your answers to 3 decimal places. ≤p≤ (b) using the point estimate of p obtained from the preliminary sample of 60 helmets, how many helmets must be tested to be 95% confident that the error in estimating the true value of p is less than 0.02? n= (c) how large must the sample be if we wish to be at least 95% confident that the error in estimating p is less than 0.02, regardless of the true value of p?

a)0.154<p<0.48[

b)n≅ 6.57

c)n=2401

Step-by-step explanation:

n = 60

Sample proportion = p = 16/60 = 0.266

a) Find a 95% two-sided confidence interval on the true proportion of helmets

90 % confidence interval fro population is

hence population proportion lies in the confidence interval

b) helmets must be tested to be 95% confident

point of estimates i s- 0.266

Margin of error = 0.02

after putting values we get

n = 6.56

n≅ 6.57

c)large must the sample be

The sample is calculted as

n=2401

to find the perimeter of the rectangle this is the expression:

x-9+x-9+3x-4+3x-4=138

if we simplify it:

8x-26=138

remember, 138 is what it all adds up to

the length is 11.5cm

the width is 57.5cm

the area is 661.25cm^2

the answers might not be correct use at own risk

the ratio of grapes to blueberries she should use is 12: 3

step-by-step explanation:

if mandie is making 15 cups of fruit salad, the ratio of grapes to blueberries she should use is 12: 3.