Normal distribution-population proportions

Reference no: EM13106310

1) Assume that the population proportions are to be estimated from the samples described. Find the margin of error and the 95% confidence interval.

Sample size = 256, sample proportion = 0.6

2) Importance: A Phone survey of 500 people revealed that 99% of those surveyed ranked good relationships as important or very important, 98% ranked financial security as important or very important. Third on the list was religious fulfillment at 86%, followed by a good sex life at 82%, and job satisfaction at 79%. The margin of error for the study was reported at 4% points.

Is the reported margin of error consistent with the sample size?

3) For each of the following, give the 95% confidence interval:

a) 17.2% of people in Florida are inactive, sample size = 1,500.

b) 13.2% of people in California have poor diets, sample size = 2,500.

c) 22.9% of people in Hawaii eat pineapple regularly, sample size = 3,500

4) A random selection of 1,600 people found that 900 support a certain lawyer in a political race. Based on the sample, would you claim that the lawyer will win a majority of the votes?

5) Estimate the minimum sample size needed to achieve the following margins of error:

E = 0.02, E = 0.05, E = 0.04, E = 0.035

6) Margin of error: In general, if one wished to decrease the margin or error by a factor of 2 in an estimation of a population proportion from E = 0.02 to 0.01, by what factor should the sample size be increased?

Reference no: EM13106310

Questions Cloud

What is the magnitude of the crankshaft angular acceleration : From the equation for the line of best fit given, what is the magnitude of the crankshaft's angular acceleration? Express your answer using two significant figures.

Calculate minimize total annual costs of holding : Suppose that you are the manager of a production department that uses 400 boxes of rivets per year. The supplier quotes you a price of $8.50 per box for an order size of 199 boxes or less.

Speaker in poem the unknown citizen mean by unknown citizen : For Auden's "The Unknown Citizen": What does speaker in poem believe of Unknown Citizen? What do you believe of Unknown Citizen? Is speaker another "unknown citizen.

What are the magnitudes of the normal force : A car (m = 1610 kg) is parked on a road that rises 17° above the horizontal. What are the magnitudes of (a) the normal force and (b) the static frictional force that the ground exerts on the tires?

Normal distribution-population proportions : Assume that the population proportions are to be estimated from the samples described. Find the margin of error and the 95% confidence interval.

Calculate the ratio of the electric potential at the surface : Consider two isolated, charged conducting spheres: a large sphere and a second smaller sphere with a radius 8 times smaller than that of the large sphere, but with 4 times as much charge.

Estimation of economic order quantity : Given the following data for a particular inventory item: Usage 500 units/week Ordering $40 per order Carrying Cost $.01 per unit per week Lead Time 3 weeks Price $.50 per unit

Sample for a given confidence interval : I have a problem that wants to know the sample size of Illinois republican voters, they want to know the sample size with 95% confidence and 3% margin of error, not sure how to get started.

Determine the effective purchasing power : Fourteen years ago, the U.S. Aluminum Corporation borrowed $9.9 million. Since then, cumulative inflation has been 98 percent (a compound rate of approximately 5 percent per year).

User Account

All Pages