statistics for managers

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statistics homework due tomorrow by 6-please respond asap
textbook: statistics for managers using excel 5th edition working on chapter 10

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10.9 Millions of dollars are spent each yr on diet foods. Trends such as the low fat diet or the low carb Atkins diet have led to a host of new product. A study by Dr. Linda Stern of the Philadelphia VA Hospital compared weight loss between obese patients on a low fat diet and obese patients on a low carb diet. Let Âľ1 represent the mean number of pounds obese patients on a low fat diet lose in six months and Âľ2 represent the mean number of pounds obese patients on a low carb diet lose in six months.

a. State the null and alternative hypothesis if you want to test whether the mean weight loss between the two diets is equal.
b. In the context of this study, what is the meaning of a Type I error?
c. In the context of this study, what is the meaning of a Type II error?
d. Suppose that a sample of 100 obese patients on a low fat diet lost a mean of 7.6 pounds in six months, with a standard deviation of 3.2 pounds, while a sample of 100 obese patients on a low carb diet lost a mean of 6.7 lbs. in 6 mths., with a standard deviation of 3.9 lbs. Assuming that the population variances are equal and using a .05 level of significance, is there evidence of a difference in the mean weight loss of obese patients between the low fat and low carb diets?

10.51
A bank with a branch located in a commercial district of a city has developed an improved process for serving customers during the noon to 1pm lunch period. The waiting time (operationally defined as the time elapsed from when the customer enters the line until he or she reaches the teller window) of all customers during this hour is recorded over a period of one week. A random sample of 15 customers is selected and the results are as follows:

4.21 5.55 3.02 5.13 4.77 2.34 3.54 3.20

4.50 6.10 0.38 5.12 6.46 6.19 3.79
Suppose that another branch, located in a residential area, is also concerned with the noon to 1pm lunch period. A random sample of 15 customers is selected and the…

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Statistics for Managers

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2. The standard error of the mean is actually the standard deviation of all of the means that make up the distribution of sample means?


3. Each different t-distribution is defined by which of the following?

@Answer found in section 4.3 The One-sample t-Test, in Statistics for Managers ?


4.

What is the advantage of a one-tailed test over a two-tailed test?

@Answer found in section 4.3 The One-sample t-Test, in Statistics for Managers?


5. . How does variability in the distribution of sample means compare to variability in a population based on individual scores?


6.The desired sample size depends only the size of the population to be tested – TURE OR FALSE ?


. 7. Random samples always accurately reflect the population they were drawn from.- TRUE OR FALSE



8. The one-sample t-test differs from the z-test in which way?

@Answer found in section 4.3 The One-sample t-Test, in Statistics for Managers



9.

Question 9. 9. The z-test can be used to test mean differences even when the
initial data set is not normally distributed.- TRUE OR FALSE



10. The z- test requires an estimate of the population standard deviation. True OR FALSE


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Statistics for managers

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1.17 Classify each of the following qualitative variables as ordinal or nominative. Explaine your answers in DETAIL.
Qualitative Variable Categories
Statistics course letter grade A B C D
Door choice on Let’s Make a Deal Door #1 Doort# 2
Television show classifications TV-G TV-PG TV-14 TV-MA
Peronal comp…

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statistics for managers

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The X2 statistic is used to test whether the assumption of normality is reasonable for a given population distribution. The sample consists of 5000 observations and is divided into 6 categories (intervals). The degrees of freedom for the chi-square statistic is: (Points : 1)

a 4999
b 6
c 5
d 4
e 3

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statistics for managers

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When using the chi-square goodness of fit test with multinomial probabilities, the rejection of the null hypothesis indicates that at least one of the multinomial probabilities is not equal to the value stated in the null hypothesis

A. True

b, False

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Statistics for Managers

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The final paper provides you with an opportunity to integrate and reflect on what you have learned during the class.

The question to address is: “What have you learned about statistics?”  In developing your responses, consider – at a minimum – and discuss the application of each of the course elements in analyzing and making decisions about data (counts and/or measurements).
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The course elements include:

  • Descriptive statistics
  • Inferential statistics
  • Hypothesis development and testing
  • Selection of appropriate statistical tests
  • Evaluating statistical results.

Writing the Final Paper

The Final Paper:

  1. Must be three to- five double-spaced pages in length, and formatted according to APA style.
  2. Must include a title page with the following:
    1. Title of paper
    2. Student’s name
    3. Course name and number
    4. Instructor’s name
    5. Date submitted
  3. Must begin with an introductory paragraph that has a succinct thesis statement.
  4. Must address the topic of the paper with critical thought.
  5. Must end with a conclusion that reaffirms your thesis.
  6. Must use at least three scholarly sources, in addition to the text.
  7. Must document all sources in APA style.
  8. Must include a separate reference page, formatted according to APA style.

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