Purchase Solution

Sample Mean and Population Mean: Standard Deviation

Not what you're looking for?

Ask Custom Question

Please explain how to set up and solve. I have attempted to answer, please let me know if right or wrong...

A sample of n= 36 scores is selected form a population with o= 12. if the sample mean of M=56 produces a z score of z= +3.00 then what is the population mean?
* 56
*52 (is this correct?)
* 54
*50

A sample of n= 9 scores is obtained from a population with u= 70 and o= 18. if the sample mean is M=76, what is the z-score for the sample mean?
* z= 0.50
*z= 1.00
*z= 0.33 ( is this correct?)
* z= 3.00

A random sample of n=4 scores is obtained from a normal population with u= 30 and o= 8. what is the probability that the sample mean will be smaller than M= 22?
* 0.00003
* 0.1587 ( is this correct?)
* 0.3085
* 0.0228

a random sample of n= 9 scores is obtained from a normal population with u= 40 and o= 18. what is the probability that the sample mean will be greater than M= 43?
* 0.1587
*0.0228
*0.4325 ( is this correct?)
* 0.3085

Purchase this Solution
Solution Summary

A few problem related to sample and population mean are solved here.

Solution Preview

1.
=> M-u = z*o/sqrt(n)
=> 56 - u = 3*12/sqrt(36)
=> u = 56 - 3*12/6 = 50

2.
z = ...

Solution provided by:
Amrit Lal Ahuja, PhD (IP)
Education
  • BEng, Allahabad University, India
  • MSc , Pune University, India
  • PhD (IP), Pune University, India
Recent Feedback
  • " In question 2, you incorrectly add in the $3.00 dividend that was just paid to determine the value of the stock price using the dividend discount model. In question 4 response, it should have also been recognized that dividend discount models are not useful if any of the parameters used in the model are inaccurate. "
  • "feedback: fail to recognize the operating cash flow will not begin until the end of year 3."
  • "Answer was correct"
  • "Great thanks"
  • "Perfect solution..thank you"
Purchase this Solution
Free BrainMass Quizzes
Know Your Statistical Concepts

Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.

Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.

Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.

Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.

View More Free Quizzes
Related BrainMass Solutions

  • What would be the mean, variance, standard deviation and shape of the distribution of sample means?

    population, sample mean distribution will follow normal distribution with mean=18 and standard deviation=0.5774 Solution discusses mean, standard deviation and variance of a given sampling distribution with formulas and calculations.

  • distribution of sample means, deviation, sample size, random selection

    Given the population mean  = 60 and standard deviation  = 24. Let M denotes the sample mean of a sample of size n taken from this population.

  • Population and Standard Mean

    506253 Population and Standard Mean 1. Assume the population standard deviation is a=25.

  • Sample mean and standard deviation of a manufacturer

    , the sample mean is 18.4 and sample standard deviation is s=1.536 (please see the attached file) To test the hypotheses: (please see the attached file) H0: The population mean is 21.9 hours H1: The population mean is NOT 21.9 hours We use

  • Confidence intervals

    4509 Test whether the sample has been drawn from the population. A Variable has a mean of 100 and a standard deviation of 16. Four observations of this variable have a mean of 108 and a sample standard deviation of 12.

  • 13 Probability Statements: True or False?

    The smallest possible standard error is obtained when a sample sample is taken from a population with a small standard deviation. False as there is no relation between population standard deviation and standard deviation.

  • Multiple choice questions

    157422 Bus stats homework 6 Multiple choice questions on sample means, standard deviation, sample size, normal distribution, t distribution 1) IF the sampled population has a mean 48 and standard deviation 16, then the mean and the standard deviation

  • Simple Random Sampling

    Solution Population mean, = 64.6 Population Standard deviation, = 3.2 Population Size N = 150 Sample Size n = 36 Finite population correction factor, fpc = = = 0.8747 Sample mean = 64.6 Sample standard deviation, = = = 0.466507

  • How to explain the influences on z-scores

    In hypothesis testing, z- score is calculated as z = (Sample mean - Population mean)/(population standard deviation/square root of sample size) Thus, z = (Sample mean - Population mean) * Square root of sample size / Population standard deviation

  • Sample Size

    sample size=n= 41 sample standard deviation s= 3.32 inches inches Since population standard deviation is not given we may assume that the sample standard deviation is the population standard deviation. s=s= 3.32 Standard error of the mean

View More Related Solutions