Finding confidence interval for mean grade

Reference no: EM1318188

Q1) 50 students are enrolled in Economics class. After first examination, a random Sample of 5 papers had the following grades: 60, 75, 80, 70, and 90.

a) Compute the standard error.

b) Find out 90% confidence interval for mean grade of all the students in the class.

c) What is the margin of error?

Q2) New brand of breakfast cereal is being market tested. 100 boxes of cereal were given to consumers to try. Consumers were asked whether they liked or disliked the cereal. You are given their responses below.

Response	Frequency
Liked	60
Disliked	40
	100

a) What is the point estimate of the proportion of people who like cereal?

b) Create a 95% confidence interval for proportion of all consumers who will like the cereal.

c) Determine the margin of error for 95% confidence interval that you constructed in part b?

Reference no: EM1318188

Questions Cloud

Mean deviation-standard deviation-range for discrete data : The weights (in pounds) of a sample of five boxes being sent by UPS are: 12, 6, 7, 3, & 10.

Give the dimensions of the matrix : Give the dimensions of the matrix.

Explaining content of document in natural language : Explain the content of this document in natural language;Design the graph representation of document;

Show the applications of exponential function : Applications of exponential function: Principal, rate, time - evaluate an exact solution and the check your solution using the estimate of the "law of 72".

Finding confidence interval for mean grade : Find out 90% confidence interval for mean grade of all the students in the class.

Probability for sample mean under the normal distribution : A random sample of 100 oranges is gathered and the mean diameter obtained was 5.12. If another sample of 100 is taken, what is the possibility that its sample mean will be greater than 5.12 inches.

Show logarithm into exponential form : Express logarithm into exponential form and solve logarithmic equation and solve the log 4 2 = 1/2 in exponential form.

Testing hypothesis using a critical value : Using a critical value, test hypothesis at the 1% level of significance.

Find how many of each brand should the store stock : Find how many of each brand should the store stock

User Account

All Pages