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Math Help - QUIZ

  1. #1
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    Exclamation QUIZ

    Here is a quiz tht I have to have done by tomorrow, the problem is is that I do not understand any of this so if anyone could help, I would appreciate it more than you would ever know.

    Here is the quiz:

    Please place all your work in one Excel file and place it in the Assignments folder.

    T F 1. If 40 samples of size 21 were selected from a population of 22,493, we would expect the mean of the sample means and the population mean to be close but not exactly equal.

    T F 2. If the sample size keeps getting larger and larger and finally equals the size of the population, there would be no error in predicting the population mean because the sample size and the size of the population would be the same.

    3. As the size of the sample increases, what happens to the shape of the sampling means?
    A. Cannot be predicted in advance
    B. Approaches a normal distribution
    C. Positively skewed
    D. Negatively skewed

    T F 4. The level of significance is the risk we assume of rejecting the null hypothesis when it is actually true.

    T F 5. There is no one level of significance that is applied to all studies involving sampling.
    T F 6. If we do not reject the null hypothesis based on sample evidence, we have proven beyond doubt that the null hypothesis is true.
    7. What value does the null hypothesis make a claim about?
    A. Population parameter
    B. Sample statistic
    C. Sample mean
    D. Type II error

    T F 7. The Student t distribution has a greater spread than does the z distribution. As a result, the critical values of t for a given level of significance are larger in magnitude than the corresponding z critical values.

    T F 8. Since there is more variability in sample means computed from smaller samples, we have more confidence in the resulting estimates and are less apt to reject null hypothesis.

    9. From RES 341 review problem: A survey of 600 randomly selected people reveals that 384 of them think that the President of the United States is doing a good job regarding domestic issues.

    a. What is the point estimate and what does this mean?


    b. What is the 95% confidence interval to estimate the true proportion of people who think the president is doing a good job?

    c. Interpret the interval you developed above.


    10. The mean length of a small counterbalance bar is 43 millimeters. The production supervisor is concerned that the adjustments of the machine producing the bars have changed. He asks the Engineering Department to investigate. Engineering selects a random sample of 12 bars and measures each. The results are reported below in millimeters:

    42 39 42 45 43 40 39 41 40 42 43 42

    Is it reasonable to conclude that there has been a change in the mean length of the bars? Use the .02 level of significance. Show all 5 steps interpret your conclusion!
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  2. #2
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    Quote Originally Posted by foofergutierrez View Post
    Here is a quiz tht I have to have done by tomorrow, the problem is is that I do not understand any of this so if anyone could help, I would appreciate it more than you would ever know.

    Here is the quiz:

    Please place all your work in one Excel file and place it in the Assignments folder.

    T F 1. If 40 samples of size 21 were selected from a population of 22,493, we would expect the mean of the sample means and the population mean to be close but not exactly equal.

    T F 2. If the sample size keeps getting larger and larger and finally equals the size of the population, there would be no error in predicting the population mean because the sample size and the size of the population would be the same.

    3. As the size of the sample increases, what happens to the shape of the sampling means?
    A. Cannot be predicted in advance
    B. Approaches a normal distribution
    C. Positively skewed
    D. Negatively skewed

    T F 4. The level of significance is the risk we assume of rejecting the null hypothesis when it is actually true.

    T F 5. There is no one level of significance that is applied to all studies involving sampling.
    T F 6. If we do not reject the null hypothesis based on sample evidence, we have proven beyond doubt that the null hypothesis is true.
    7. What value does the null hypothesis make a claim about?
    A. Population parameter
    B. Sample statistic
    C. Sample mean
    D. Type II error

    T F 7. The Student t distribution has a greater spread than does the z distribution. As a result, the critical values of t for a given level of significance are larger in magnitude than the corresponding z critical values.

    T F 8. Since there is more variability in sample means computed from smaller samples, we have more confidence in the resulting estimates and are less apt to reject null hypothesis.

    9. From RES 341 review problem: A survey of 600 randomly selected people reveals that 384 of them think that the President of the United States is doing a good job regarding domestic issues.

    a. What is the point estimate and what does this mean?


    b. What is the 95% confidence interval to estimate the true proportion of people who think the president is doing a good job?

    c. Interpret the interval you developed above.


    10. The mean length of a small counterbalance bar is 43 millimeters. The production supervisor is concerned that the adjustments of the machine producing the bars have changed. He asks the Engineering Department to investigate. Engineering selects a random sample of 12 bars and measures each. The results are reported below in millimeters:

    42 39 42 45 43 40 39 41 40 42 43 42

    Is it reasonable to conclude that there has been a change in the mean length of the bars? Use the .02 level of significance. Show all 5 steps interpret your conclusion!
    In the words of a tennis great, you cannot be serious.

    My first question is why you don't understand any of it. Have you been keeping up to date with the work and geting help from your instructor as required?

    My second question is why have you left this until the very last moment.

    My final remark is that if you want help it's expected that you show some sort of effort. I personally find it galling that you would include the instruction "Please place all your work in one Excel file and place it in the Assignments folder". This to me shows absolutely no thought on your part in what you're posting here.
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  3. #3
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    For your info, I am working on it, I had to finish 4 problems similar to this before I started so that is why none of the work I have done is here, that was like 8 hours ago...and I do not understand it because the book we have is absolute trash and makes no sense to anyone in our class. I am trying to get this done with help so I can make sure that I can get a partial grade since I know that I cannot manage to get one problem right all the way. As for the Excel part, I did not realize that I posted it, I didn't erase that part but I erased the part above it, my bad. Never mind though, nearly every time I post to get help on here, I get criticized so why even bother. You people make feel like an idiot and an for even asking, so thanks but no thanks, I'd rather fail than have help from people who don't want to help. I will not come to this site again. Thanks for nothing.
    Last edited by ThePerfectHacker; September 19th 2008 at 06:21 AM.
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  4. #4
    Super Member 11rdc11's Avatar
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    People forget everyone on this board is volunteering and have other things to do in their lives. Now we don't mind helping you work on a problem or working an example for you so you may better understand the material but we will not do your assignment. Also when you wrote "Please place all your work in one Excel file and place it in the Assignments folder" it looked as if you just wanted the answers and didn't want to even try to answer the questions for yourself. Now you said you posted that by mistake but you have to understand how we would interpret that statement.
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  5. #5
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by foofergutierrez View Post
    For your info, I am working on it, I had to finish 4 problems similar to this before I started so that is why none of the work I have done is here, that was like 8 hours ago...and I do not understand it because the book we have is absolute trash and makes no sense to anyone in our class. I am trying to get this done with help so I can make sure that I can get a partial grade since I know that I cannot manage to get one problem right all the way. As for the Excel part, I did not realize that I posted it, I didn't erase that part but I erased the part above it, my bad. Never mind though, nearly every time I post to get help on here, I get criticized so why even bother. You people make feel like an idiot and an a--hole for even asking, so thanks but no thanks, I'd rather fail than have help from people who don't want to help. I will not come to this site again. Thanks for nothing.
    firstly, in the way you posted all this, you are asking for cheat-partners, not help

    secondly, you seemed to have gotten quite a lot of help here before.

    i know you are probably frustrated, but Mr F made some legitimate points! you cannot post a quiz and expect help like you are asking. explicitly helping you is academically dishonest. the most we can do is guide you, and for that, you must say what you have tried and wait for feedback. it would also help not to post something like this last minute
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  6. #6
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    I am not looking for a cheat partner just someone to help me better understand all of this information that the school is cramming into a five week period. It is not last second, I have been trying to do this on my own for a few days and as sad as it may be, I have gotten no where whatsoever and thought that I needed some help from people who understand this type of work. I do not understand statistics, I will never use statistics but I have to pass this class in order to get my degree and there is no way around it, if I fail I pay to retake it until I pass and there is no financial way that I can do that. Also, I did not know that we could attach Excel to show on here or else I would have done that to prove to you that I am working on it. So you see, I am looking for help, not someone to do my work for me, I tried to learn this material but I do not have hours and hours of time to devote to it, I may have posted it the wrong way making everyone think that I wanted it done for me but it was misinterpreted and that is how we are here. Just don't worry about it now, I have no clue what to do and no patience to try and learn all of this nonsense.
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