MATH 221 (MATH221)
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Examen
MATH 221 Week 7 Quiz
1. Question:(CO 4) From a random sample of 68 businesses, it is found that the mean time that employees spend on personal issues each week is 4.9 hours with a standard deviation of 0.35 hours. What is the 95% confidence interval for the amount of time spent on personal issues? 2. Question:(CO 4)If a confidence interval is given from 8.50 to 10.25 and the mean is known to be 9.375, what is the margin of error? 3. Question:(CO 4) If the population standard deviation of a sample increases without...
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Examen
MATH 221 Week 7 Quiz
1. Question:(CO 4) From a random sample of 55 businesses, it is found that the mean time that employees spend on personal issues each week is 4.9 hours with a standard deviation of 0.35 hours. What is the 95% confidence interval for the amount of time spent on personal issues? 2. Question:(CO 4) If a confidence interval is given from 8.56 to 10.19 and the mean is known to be 9.375, what is the margin of error? 3. Question:(CO 4) If the population standard deviation of a sample increases withou...
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MATH 221 Week 7 Discussion; Regression
Suppose you are given data from a survey showing the IQ of each person interviewed and the IQ of his or her mother. That is all the information that you have. Your boss has asked you to put together a report showing the relationship between these two variables. What could you present and why?
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MATH 221 Week 6 Homework; Statistics for Decision-Making (June 2020v2)
1. Question:A consumer analyst reports that the mean life of a certain type of alkaline battery is no more than 36 months. Write the null and alternative hypotheses and note which is the claim. 2. Question:A business claims that the mean time that customers wait for service is at most 9.2 minutes. Write the null and alternative hypotheses and note which is the claim. 3. Question:An amusement park claims that the average daily attendance is at least 12,000. Write the null and alternative hypoth...
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MATH 221 Week 6 Homework; Statistics for Decision-Making (June 2020v1)
1. Question:A consumer analyst reports that the mean life of a certain type of alkaline battery is more than 63 months. Write the null and alternative hypotheses and note which is the claim. 2. Question:A business claims that the mean time that customers wait for service is at most 9.2 minutes. Write the null and alternative hypotheses and note which is the claim. 3. Question:An amusement park claims that the average daily attendance is at least 12,000. Write the null and alternative hypothese...
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MATH 221 Week 6 Homework; Statistics for Decision-Making
1. Question:A consumer analyst reports that the mean life of a certain type of alkaline battery is more than 63 months. Write the null and alternative hypotheses and note which is the claim. 2. Question:A business claims that the mean time that customers wait for service is at most 9.2 minutes. Write the null and alternative hypotheses and note which is the claim. 3. Question:An amusement park claims that the average daily attendance is at least 10,000. Write the null and alternative hypothese...
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MATH 221 Week 6 Discussion; Hypotheses in the Real World
Consider a business of any type. What is a situation where a hypothesis test might help make a decision? Describe the situation. Then you or someone in a reply can make up numbers for that situation and someone else can solve it.
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MATH 221 Week 6 Lab Assignment
Statistical Concepts: • Confidence Intervals • Data Simulation • Normal Probabilities Short Answer Writing Assignment All answers should be complete sentences. In the Week 2 Lab, you found the mean and the standard deviation for the SLEEP variable for both males and females. Use those values for follow these directions to calculate the numbers again. (From Week 2 Lab: Calculate descriptive statistics for the variable Sleep by Gender. Sort the data by gender by clicking on...
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MATH 221 Week 6 LAB Assignment
Statistical Concepts: • Confidence Intervals • Data Simulation • Normal Probabilities Short Answer Writing Assignment All answers should be complete sentences. In the Week 2 Lab, you found the mean and the standard deviation for the SLEEP variable for both males and females. Use those values for follow these directions to calculate the numbers again. (From Week 2 Lab: Calculate descriptive statistics for the variable Sleep by Gender. Sort the data by gender by clicking on...
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MATH 221 Week 5 Discussion; Confidence Interval Concepts
Look in the newspapers, magazines, and other news sources for results of a survey or poll that show the confidence interval, usually shows as a +/- some amount. Describe the survey or poll and then describe the interval shown. How does knowing the interval, rather than just the main result, impact your view of the results?
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MATH 221 Week 5 Homework; Statistics for Decision-Making
1. Question:From a random sample of 58 businesses, it is found that the mean time the owner spends on administrative issues each week is 20.53 with a population standard deviation of 3.23. What is the 95% confidence interval for the amount of time spent on administrative issues? 2. Question:If a confidence interval is given from 43.83 up to 61.97 and the mean is known to be 52.90, what is the margin of error? 3. Question:If a car manufacturer wanted lug nuts that fit nearly all the time, what ...
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MATH 221 Week 5 Homework; Statistics for Decision-Making
1. Question:From a random sample of 58 businesses, it is found that the mean time the owner spends on administrative issues each week is 20.53 with a population standard deviation of 3.54. What is the 95% confidence interval for the amount of time spent on administrative issues? 2. Question:If a confidence interval is given from 43.83 up to 61.97 and the mean is known to be 52.90, what is the margin of error? 3. Question:If a grocery store purchases paper bags from a company, they want them ge...
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MATH 221 Week 5 Homework; Statistics for Decision-Making
1. Question:From a random sample of 58 businesses, it is found that the mean time the owner spends on administrative issues each week is 20.53 with a population standard deviation of 3.23. What is the95% confidence interval for the amount of time spent on administrative issues? 2. Question:If a confidence interval is given from 43.85 up to 61.95 and the mean is known to be 52.90, what is the margin of error? 3. Question:If a computer manufacturer needed a supplier that could produce parts that...
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MATH 221 Week 5 Homework; Statistics for Decision-Making
1. Question:From a random sample of 58 businesses, it is found that the mean time the owner spends on administrative issues each week is 21.69 with a population standard deviation of 3.54. What is the 95% confidence interval for the amount of time spent on administrative issues? 2. Question:If a confidence interval is given from 43.85 to 61.95 and the mean is known to be 52.90, what is the margin of error? 3. Question:If a shirt manufacturer wanted to make shirts that fit most individuals, wha...
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Examen
MATH 221 Week 5 Quiz
1. Question: Let x represent the number of cars in a parking lot. This would be considered what type of variable: 2. Question: Let x represent the height of corn in Oklahoma. This would be considered what type of variable: 3. Question: If you created the probability distribution for these data, what would be the probability of 40-49? 4. Question: Consider the following table.Find the mean of this variable. 5. Question: Consider the following table. Find the variance of this variable. 6. Que...
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MATH 221 Week 5 Quiz
1. Question:(CO 3) Consider the following table. If you created the probability distribution for these data, what would be the probability of 40-49? 2. Question:(CO 3) Consider the following table of hours worked by part-time employees. These employees must work in 5-hour blocks.Find the mean of this variable. 3. Question:(CO 3) Consider the following table. Find the variance of this variable. 4. Question:(CO 3) Consider the following table. Find the standard deviation of this variable. 5. Q...
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MATH 221 Week 5 Quiz
1. Question:(CO 3) Consider the following table. If you created the probability distribution for these data, what would be the probability of 30-39? 2. Question:(CO 3) Consider the following table of hours worked by part-time employees. These employees must work in 5-hour blocks.Find the mean of this variable. 3. Question:(CO 3) Consider the following table.Find the variance of this variable. 4. Question:(CO 3) Consider the following table.Find the standard deviation of this variable. 5. Que...
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MATH 221 Week 5 Quiz
1. Question:(CO 3) Consider the following table. If you created the probability distribution for these data, what would be the probability of 60-69? 2. Question:(CO 3) Consider the following table of hours worked by part-time employees. These employees must work in 5-hour blocks.Find the mean of this variable. 3. Question:(CO 3) Consider the following table. Find the variance of this variable. 4. Question:(CO 3) Consider the following table. Find the standard deviation of this variable. 5. Q...
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MATH 221 Week 4 Homework; Statistics for Decision-Making
1. Question: The length of time a person takes to decide which shoes to purchase is normally distributed with a mean of 8.21 minutes and a standard deviation of 1.90. Find the probability that a randomly selected individual will take less than 5 minutes to select a shoe purchase. Is this outcome unusual? 2. Question: Monthly water bills for a city have a mean of $108.43 and a standard deviation of $36.98. Find the probability that a randomly selected bill will have an amount greater than $165, ...
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MATH 221 Week 4 Homework; Statistics for Decision-Making
1. Question: The length of time a person takes to decide which shoes to purchase is normally distributed with a mean of 8.54 minutes and a standard deviation of 1.91. Find the probability that a randomly selected individual will take less than 6 minutes to select a shoe purchase. Is this outcome unusual? 2. Question: Monthly water bills for a city have a mean of $108.43 and a standard deviation of $36.98. Find the probability that a randomly selected bill will have an amount greater than $165, ...
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