قديم منذ /11-01-2018, 02:19 AM   #1

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الاسئله مع حلولها في المرفقات

A type I error is the mistake of rejecting the null hypothesis when it is actually true.
The null hypothesis is rejected if the P-value > 0.05.
Two samples are dependent if the sample values are matched pairs.
In case of hypothesis testing for a sample, the t statistic is used if σ is not known and sample size n is greater than 30 (n>30).
A claim that two population proportions are equal, each of the two samples must satisfy the requirement that np ≥ 5 and nq ≥ 5.
The Student t distribution and the normal distribution are symmetric.

Area of the rejection region depends on …
Size of α
Size of β
Test-Statistic.
Number of values

A randomly selected sample of 1000 college students was asked whether they had ever used the drug ecstasy. Sixteen percent 16% or 0.16) of the 1000 students surveyed said that they had. Which one of the following statements about the number 0.16 is correct?
It’s a sample proportion.
It’s a population proportion.
It’s a margin of error.
It’s a randomly chosen number.

A decision in a hypothesis test can be made by using a
P-value
Critical Value
A and B
None of the above
When carrying out a large sample test of H0: μ_0 = 10 vs. Ha: μ_0 > 10 by using a rejection point, we reject H0 at level of significance α when the calculated test statistic is:
Less than z_α
Less than - z_α
Greater than z_(α/2)
Greater than z_α
Sample sizes n1 = 50, n2 = 50 and numbers x1 = 15, x2 = 5 of successes to find the pooled estimate p ̅
0.4
0.2
2.0
None of the above

Two teams of workers assemble automobile engines at a manufacturing plant in Michigan. A random sample of 145 assemblies from team 1 shows 130 acceptable assemblies. A similar random sample of 125 assemblies from team 2 shows 120 acceptable assemblies. The pooled proportion for acceptable assemblies is:
250/270
270/250
20/270
270/20

1. The Pew Research Center claims that more than 55% of American adults regularly watch a network news broadcast. You decide to test this claim and ask a random sample of 425 Americans whether they regularly watch a network news broadcast. Of the 425 Americans, 255 responded yes. At  = 0.05, is there enough evidence to support the claim?

2. The scores on an aptitude test required for entry into a certain job position have a mean at most 500. If a random sample of 36 applicants have a mean of 546 and a standard deviation of 120, is there evidence that their mean score is different from the mean that is expected from all applicants?
Use a 0.05 level of significance

3. Suppose a researcher believes that college faculty vote at a lower rate than college students. She collects data from 200 college faculty and 200 college students using simple random sampling. If 120 of the faculty and 150 of the students voted in the 2016 Presidential election, is there enough evidence at the 5% level of significance to support the researcher’s claim?

Given the following data of two independent samples of normally distributed populations

Data Population 1 Population 2
n 23 13
x ̅ 43 41
s 4.5 5.1
Test the claim that μ_1≠μ_2 at the α=0.05 level of significance



Construct a 95% confidence interval about μ_1-μ_2 .


6. « Can a person control certain body functions if that person is trained in a program of biofeedback exercises? An experiment is conducted to show that blood pressure levels can be consciously reduced in people trained in this program. The blood pressure measurements (in millimeters of mercury) listed in the table below represent readings before and after biofeedback training of six subjects. » Do the data provide enough evidence to indicate that the mean blood pressure level decreases after training? Use α = .05.

Before : 136.9 ; 201.4 ; 166.8 ; 150.0 ; 173.2 ; 169.3
After : 130.2 ; 180.7 ; 149.6 ; 153.2 ; 162.6 ; 160.1








الملفات المرفقة
نوع الملف: pdf Ass3 key.pdf‏ (1.00 ميجابايت, المشاهدات 65)
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