Find the mean income with a standard deviation

Assignment Help Basic Statistics
Reference no: EM13141510

At a certain university the mean income of parents of the entering class is reported to be $91,600. The president of another university feels that the parents'income for her entering class is greater than $91,600. She surveys 100 randomly selected families and finds the mean income to be $96,321 with a standard deviation of $9555.With a0.05, is she correct?

Reference no: EM13141510

Questions Cloud

Finding out the op level from an attenuator of know ip : Determining the o/p level from an attenuator of know i/p, An attenuator has an attenuation of 10 dB over the frequency range 10 MHz to 1.0 GHz
What mass of ccl4 will be formed : What mass of CCl4 will be formed if 1.20 moles of methane react with 1.55 moles of chlorine?
Realistic that a commitment to continuous improvement : 200 words..Is it realistic that a commitment to continuous improvement could actually replace operational controls? Strategic controls?
Find an equation of the tangent plane : Find an equation of the tangent plane to the parametric surface r(u,v) = (u*cos(v), u*sin(v), v) at the point defined by u=1, v=pi.
Find the mean income with a standard deviation : She surveys 100 randomly selected families and finds the mean income to be $96,321 with a standard deviation of $9555.With a0.05, is she correct?
Determining the existence of unrecorded liabilities : Which of the following is the best audit procedure for determining the existence of unrecorded liabilities?
Past-modern tendency to focus on the digital images : To what extent has the past-modern tendency to focus on the digital images (bicolage, pastiche, collage, galleries) and the social networking new response watered down the depth of coverage?
How many liters of gasoline would you need to buy : In Europe, gasoline efficiency is measured in km/L. If your car's gas mileage is 23.0 mi/gal, how many liters of gasoline would you need to buy to complete a 142-km trip in Europe?
Project profitability index : Suture Corporation's discount rate is 12%. If Suture has a 5-year investment project that has a project profitability index of zero, this means that:

Reviews

Write a Review

Basic Statistics Questions & Answers

  Predict the number of accidents per year

Predict the number of accidents per year (to the nearest whole number) for a person whose age is 45 and who works 42 hours per week.

  Estimating the mean tensile strength

Suppose the inspector is unhappy with the previous result and would like to resample. How many rolls should be sampled to estimate the mean tensile strength within 1.5 PSI with 95% confidence?

  Explain dependent samples and independent samples t test

A dependent samples t test is typically more powerful than an independent samples t test because? Reduces participant/subject variability between groups.

  Modelling using the poisson probability distribution

The number of hurricanes that are formed during each hurricane season can be modeled using the Poisson probability distribution.

  What is the pobability that percent of days production

If 100 percent of a days production is inspected whenever the sample of 10 gives 2 or more defectives, then what is the pobability that 100 percent of a days production will be inspected?

  Confidence interval for two population proportion

Find a 90% confidence interval for the difference between the proportion of men and the proportion of women who approved of Reagan's performance. What assumption do you make to use this method?

  Write decision variables to market the product

A 1-minute television ad costs $30,000 and 1- minute radio add costs $5,000. French Enterprise should decide how many television ads to buy. Write down the decision variables?

  Explain fail to reject the null hypothesis

ph in the water is 7 at the .05 significance level. Her alternative hypothesis is that the water does not have a pH of 7. For which p-value will she fail to reject the null hypothesis?

  Clarification of quantitative methods

Joe has started an iphone booth in the mall. His francise booth and other startup costs total $82,000. Joe expects to pay $240 per iphone unit and sell them for $390 each. Joe needs to reach a 10% profit margin.

  What is the confidence interval at confidence level

Samples of size 49 are taken from a population with a σ of 17. If the mean of the sample is 25, what is the confidence interval at the 90% confidence level

  Testing the new population having errors

This sample group has errors with a standard deviation of 54.7ft. At the 5% level of significance, test that the new population has errors with a standard deviation equal to 43.7ft.

  Explain relationship between correlation

Evaluate this correlation. What does this correlation tell us about the relationship between these two instruments?

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