Stats: Normal Distributions, Sample Means, and Null Hypotheses
Not what you're looking for?
1. To test Ho: μ=20 versus H1: μ<20, random sample size n=12 is obtained from a population that is known to be normally distributed with σ=2.
a. If the sample mean is determined to be 18.3, compute P-value.
b. If the researcher decides to test this hypothesis at the a=0.05 level of significance, will the researcher reject the null hypothesis?
2. Suppose you are using a=0.05 to test the claim that μ>16 using a P-value. You are given the sample statistics n=50 sample mean=16.3 and σ=1.2. find the P-value
3. To test Ho: μ= 105 versus H1: μ20 ≠105, a random sample size n=35 is obtained from a population that is known to be normally distributed with ơ= 12
a. Does the population need to be normally distributed to compute p-value?
b. If the sample mean is determined to be 100.7, compute P-value.
c. If the researcher decides to test this hypothesis at the α=0.02 level of significance , will the researcher reject the null hypothesis?
Purchase this Solution
Solution Summary
The solution determines the normal distributions, sample means, and null hypotheses.
Solution Preview
1. a. z=(18.3-20)/(2/sqrt(12))=-2.94
P value=P(z<-2.94)=0.0016
b. Since P value is less than 0.05, the research will reject the null ...
Purchase this Solution
Free BrainMass Quizzes
Terms and Definitions for Statistics
This quiz covers basic terms and definitions of statistics.
Measures of Central Tendency
Tests knowledge of the three main measures of central tendency, including some simple calculation questions.
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.
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.