# BBM203/03: David set a mathematics quiz for his students The quiz is marked out of 10 His students’ marks are summarized: Business Statistics Assignment, WOU, Malaysia

 University Wawasan Open University (WOU) Subject BBM203/03: Business Statistics

Question 1

David set a mathematics quiz for his students. The quiz is marked out of 10. His students’ marks are summarized in the table below:

• Construct an appropriate frequency table and draw a histogram to depict the data above
• Compute the mean
• Calculate the variance and standard deviation
• Calculate the coefficient of variation
• Interpret the distribution of marks as shown in your histogram

Question 2

Explain the following concepts:

• Confidence levels
• Qualitative data
• Multiplication rule
• Bayes’ Law

Question 3

Part 1

A researcher collected a sample of 50 respondents in a shopping mall on a weekend. The data are organized in the table below:

Calculate the following probabilities

• Prob (A)

Part 2

The random variable Y follows a normal distribution with mean µ and variance σ2 , i.e. Y  N(µ, σ2). Suppose we have the following information:

P(X ≤ 66) = 0.0421 and P(X ≥ 81) = 0.1298

(a) Compute the value of σ = 5

(c) Calculate P(65 ≤ X ≤ 74)

Question 4

• A sample of test scores is obtained. The scores are displayed as follows:

11, 16, 19, 15, 7, 8, 10

Test the hypothesis that the mean score is 15 at a 1% significance level

• A chemical manufacturer is concerned about the degree of contamination in the raw material shipments purchased from a supplier. Taking a random sample of 20 shipments of raw materials, the standard deviation of contamination is 3.59. Construct the 95% confidence interval for population variance.

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