Making confidence interval for population proportion

Assignment Help Basic Statistics
Reference no: EM13104686

A bank's loan officer rates applicants for credit. The ratings are normally distributed with a mean of 200 and a standard deviation of 50. If 40 different applicants are randomly selected, find the probability that their mean is above 215.

Construct a confidence interval for the population proportion p, given n = 182, x = 135; 95%.

Suppose the random variable X has a normal distribution with mean 9.0 and variance 49. The probability that X takes on a value of at least 18 is approximately equal to

Reference no: EM13104686

Questions Cloud

Academic approach to confidence interval for mean : Find a point estimate of the population mean. Find the 95% confidence interval of the true mean. Assume the population standard deviation was 0.8.
Compare best plans in jc company and tucson park : Compare the best plans in the JC Company and the Tucson Parks and Recreation Department. What do they have in common?
Confidence interval application : The US Census Bureau announce that the median sales price of new houses sold in April 2009 was $221,600 while the mean sales price was $274,300. Assume that the standard deviation of the prices is $90,000.
How much time would it take : A person walks up a stalled 14 m long escalator in 81 s. When standing on the same escalator, now moving, the person is up in 48 s. How much time would it take that person to walk up the moving escalator?
Making confidence interval for population proportion : Construct a confidence interval for the population proportion p, given n = 182, x = 135; 95%. Suppose the random variable X has a normal distribution with mean 9.0 and variance 49. The probability that X takes on a value of at least 18 is approxim..
Describe differences of oral and written communication : What are the similarities and differences of oral and written communication? What kinds of situations call for the use of oral methods?
What was the initial speed : A ball is thrown horizontally from a height of 16.2 m and hits the ground with a speed that is three times its initial speed. What was the initial speed?
What is direction of acceleration with respect to +x axis : A fish swimming in a horizontal plane has a velocity vi = (3.3i + 1.6j) m/s at a point in the ocean where the position relitive to a certian rock is ri = (10.5i - 3.9j) m. After the fish swims with a constant acceleration for 20.6 s, it's velocity..
Information about point estimate : What is the point estimator of the mean percentage of reservations that are cancelled on the day of the flight?

Reviews

Write a Review

Basic Statistics Questions & Answers

  To test the claim using chi-square test for goodness of fit

Conduct a statistical test to determine if the sample is representative of the population.

  Determining the probability of fatal accident over lifetime

Determine the probability of fatal accident over lifetime? Describe your reasoning carefully. Suppose independent events. Why might the supposition of independence be violated?

  Hypotheses to determine the perfect adjustment

Formulate the hypotheses to determine whether or not the lathe is in perfect adjustment.

  Average amount of output for shift workers

Suppose a firm evaluates the productivity of the three shifts of workers who work in their factory. Each shift's performance is measured based on the amount of output that is produced during the shift - day, evening, or swing shift.

  Relative frequency distribution

Construct a relative frequency distribution for the weights of regular Coke by starting the first class at 0.7900 lb. and use a class width of 0.0050 lb.

  Significance of correlation-t test

An assumption for a significance test of the correlation coefficient is that the populations, the variance of each variable is the same at each point of the other variable.

  Information about samples and populations

Is the sample a part of the population or the population apart of the sample? Why would researchers just not use the entire population to be more accurate? Can you give an example of a sample from a given population?

  What are the mean-variance and standard deviation

A population is normally distributed with the mean of 100 and a standard deviation of Would it be unusual for mean of sample of 3 to be 115 or more? Why or why not?

  Determining the minimum sample size

The branch manager of a pet supply store wants to study characteristics of customers of his store. In particular, he decides to focus on two variables

  One sample mean by t-test

To test this notion, eight paid volunteers were placed (individually) in a room in which there was no light from the outside and no clocks or other indications of time.

  Difference between satisfaction levels of mid country

Using a 5% level of significance, can  we say that, generally there is important difference between satisfaction levels of mid country residents and coastal residents?

  Determin ethe number of ways of room occupation

If the names of these 100 people in the building are still unknown but a room is allowed to lodge one tenant at most , then are there how many ways of room occupation?

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd