HomeworkLib
Question

For a sample of 200 entrepreneurs, a statistical test of their mean age has produced the...

For a sample of 200 entrepreneurs, a statistical test of their mean age has produced the following results:

z=31-30/sqrt(25/200)=2.8284, P=0.002339  

The sample mean of age is 31 years, its standard deviation is 5.

 What is the null hypothesis in this test and can this hypothesis be rejected? Why?  How can you tell from these results whether a one-sided test been used or a two-sided test? What is the alternative hypothesis in this test ?

math   Statistics-And-Probability   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Answer #1

0 0
Add a comment
Know the answer?
Add Answer to:
For a sample of 200 entrepreneurs, a statistical test of their mean age has produced the...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for? Ask your own homework help question. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions

  • A friend has performed a significance test of the null hypothesis that two means are equal....

    A friend has performed a significance test of the null hypothesis that two means are equal. His report states that the null hypothesis is rejected in favor of the alternative that the first mean is larger than the second. In a presentation on his work, he notes that the first sample mean was larger than the second mean and this is why he chose this particular one-sided alternative. 1. Explain what is wrong with your friend's procedure and why. a....

  • 5. [18 points] Consider the Minitab output shown below. Test of μ = 100 vs >...

    5. [18 points] Consider the Minitab output shown below. Test of μ = 100 vs > 100 The assumed standard deviation 2.4 95% Lower Bound 100.770 Mean SE Mean 101.560 3.25 25 a. Fill in the missing values in the output. Can the null hypothesis be rejected at the 0.0s level? Why? b. Is this a one-sided or a two-sided test? C. If the hypotheses had been Ho: μ = 99 versus H : μ > 99, would you reject...

  • A steel factory produces iron rods that are supposed to be 36 inches long. The machine that makes...

    A steel factory produces iron rods that are supposed to be 36 inches long. The machine that makes these rods does not produce each rod exactly 36 inches long. The lengths of these rods vary slightly. It is known that when the machine is working properly, the mean length of the rods is 36 inches. According to design, the standard deviation of the lengths of all rods produced on this machine is always equal to .05 inches. The quality control...

  • A steel factory produces iron rods that are supposed to be 36 inches long. The machine...

    A steel factory produces iron rods that are supposed to be 36 inches long. The machine that makes these rods does not produce each rod exactly 36 inches long. The lengths of these rods vary slightly. It is known that when the machine is working properly, the mean length of the rods is 36 inches. According to design, the standard deviation of the lengths of all rods produced on this machine is always equal to .05 inches. The quality control...

  • A friend has performed a significance test of the null hypothesis that two means are equal....

    A friend has performed a significance test of the null hypothesis that two means are equal. His report states that the null hypothesis is rejected in favor of the alternative the first mean is larger than the second. In a presentation on his work, he notes that the first sample mean was larger than the second mean and this is why he chose this particular one-sided alternative. (a) Explain what is wrong with your friend's procedure and why. We should...

  • In a test of hypothesis, the null hypothesis is that the population mean is equal to...

    In a test of hypothesis, the null hypothesis is that the population mean is equal to 90 and the alternative hypothesis is that the population mean is not equal to 90. The test is to be made at the 10% significance level. A sample of 100 elements selected from this population produced a mean of 84 and a standard deviation of 8. What is the value of the observed test statistic, z?

  • Age Formulas 30 Sample size 47 38 27 Sample mean (2 decimals) 31.51 =AVERAGE(A:A) 35...

    Age Formulas 30 Sample size 47 38 27 Sample mean (2 decimals) 31.51 =AVERAGE(A:A) 35 26 Sample Standard Deviation (4 decimals) 4.1852 =STDEV.S(A:A) 36 29 Hypothesized Mean 32 34 33 Test Statistic (3 decimals) -0.802 =(D4-D8)/(D6/SQRT(D2)) 33 29 Degrees of Freedom 46 =D2-1 31 40 p-value (3 decimals) need this need this 25 35 Level of Significance (Alpha) 0.05 32 27 Reject Null Hypothesis? #N/A 31 36 34 34 32 31 31 32 30 39 25 29 31 37 37...

  • In the past the average age of employees of a large corporation has been 40 years....

    In the past the average age of employees of a large corporation has been 40 years. Recently, the company has been hiring older individuals. In order to determine whether there has been an increase in the average age of all the employees, a sample of 25 employees was selected. The average age in the sample was 42.5 years with a sample standard deviation of 5 years. Using a significance level of α = .01, do the sample data provide support...

  • 2. The average number of cups of coffee drunk each day by a randomly selected sample...

    2. The average number of cups of coffee drunk each day by a randomly selected sample of 25 students was 4.4. Assume the population standard deviation is 0.5 cups of coffee. Does the sample provide enough statistical evidence to support a claim that students drink 4 cups of coffee per day on average? Test the hypothesis at a 1% level of significance. Perform a 1-sample Z-test of mean to assess the sample evidence. A. State the null and alternative hypotheses...

  • 2. One Sample t-test for Population Mean A vendor claims that the average weight of a shipment of...

    2. One Sample t-test for Population Mean A vendor claims that the average weight of a shipment of parts is 1.84. The customer randomly chooses 64 parts and finds the sample has an average of 1.88 and standard deviation of 0.03. Should the customer reject the lot? Assume the customer wants to be 95% confident that the supplier's claim is incorrect before he rejects. (This is the same as the last example, except that 0.03 is the sample standard deviation...

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT