(Problem 4) A random sample of starting salaries for an engineer are: $40,000, $40,000, $48,000, $55,000 and $67,000. Find the following and show all...
(Problem 4) A random sample of starting salaries for an engineer are: $40,000, $40,000, $48,000, $55,000 and $67,000.Â Find the following and show all work (2 points each).Â Include equations, a table or EXCEL work, to show how you found your solution.(a) Mean(b) Median(c) Mode(d) Standard Deviation(e) If a recent graduate is considering a career in engineering, which statistic (mean or median) should they consider when determining the starting salary they are likely to make?Â Explain your answer.(Problem 5) The checkout times (in minutes) for 12 randomly selected customers at a large supermarket during the storeâ€™s busiest time are as follows:Â 4.6, 8.5, 6.1, 7.8, 10.7, 9.3, 12.4, 5.8, 9.7, 8.8, 6.7, 13.2HINT: DO NOT use EXCEL to calculate quartiles, as the method used by EXCEL is not the same as the standard method we use in our course. It is best to find the quartile values by hand. You should use the approach shown in Example 2.13 (page 87) of the Illowsky text.(a â€“ 2 points) What is the mean checkout time?(b â€“ 2 points) What is the value for the 25% percentile (first quartile) Q1?(c â€“ 2 points) What is the value for the 50% percentile (median)?(d â€“ 2 points) What is the value for the 75% percentile (third quartile) Q3?(e â€“ 2 points) Construct a boxplot of the dataset.(Problem 6) Consider two standard dice where each die has six faces (numbered 1 to 6).(a â€“ 2 points) List the number of outcomes in the sample space when you roll both dice.(b â€“ 2 points) What is the probability of rolling a 2, or 3 or 4 with one die?(c -Â 2 points) You roll both dice, one at a time. What is the probability of rolling a 3 with the first die and an EVEN number with the second die?(d â€“ 2 points) You roll both dice at the same time. What is the probability the sum of the two dice is less than 5?(e â€“ 2 points) You roll both dice, one at a time. What is the probability that the second die is greater than 3, given that the first die is an odd number? Think about this one â€¦ it is tricky.(Problem 7) You are given a box of 100 cookies. 36 contain chocolate and 12 contain nuts. 8 cookies contain both chocolate and nuts.(a â€“ 3 points) Draw a Venn diagram representing the sample space and label all regions. You may draw the diagram by hand, if desired.(b â€“ 1 points) What is the probability that a randomly selected cookie contains chocolate? Â (c â€“ 3 points ) What is probability that a randomly selected cookie contains chocolate OR nuts? HINT: This result will be the union of your Venn diagram areas.Â (d â€“ 3 points) What is the probability that a randomly selected cookie contains nuts, given that it contains chocolate?(Problem 8) Assume a baseball team has a lineup of 9 batters.(a â€“ 4 points) How many different batting orders are possible with these 9 players?(b â€“ 4 points) How many different ways can I select the first 3 batters? HINT: This is a permutation.(c â€“ 2 points) Is a â€œCombination Lockâ€ really a permutation or combination of numbers?Â Explain your answer.(Problem 9) You are playing a game with 3 prizes hidden behind 4 doors. One prize is worth $100, another is worth $40 and another $20. You have to pay $100 if you choose the door with no prize.(a â€“ 4 points) Construct a probability table.Â See your homework for Illowsky, Chapter 4, #72.(b â€“ 3 points) What is your expected winning?(c â€“ 3 points) What is the standard deviation of your winning? (HINT: Use the expanded table, similar to your homework, Illowsky, Chapter 4, #72)(Problem 10) Suppose that 85% of graduating students attend their graduation. A group of 22 graduating students is randomly chosen.Â Let X be the number of students that attend graduation.Â As we know, the distribution of X is a binomial probability distribution.Â Answer the following:(a â€“ 1 point) What are the number of trials (n)?(b â€“ 1 point) What is the probability of successes (p)?(c â€“ 1 point) What is the probability of failures (q)?(d â€“ 2 points) How many students are expected to attend graduation?(e â€“ 5 points) What is the probability that exactly 18 students attend graduation? (HINT: This is tougher than it looks. You will need use a Binomial Probability Function, so review Illowsky, Chapter 4, #88).Â
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Jan 02, 2020
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