Math221 - Study guides, Class notes & Summaries

Course pack chapter 1.1 & 1.2: Precalculus Review Supplement Examples

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...

MATH221 Final Exam(Latest Quest & Ans)/MATH221 Final Exam(Latest Quest & Ans)

1. Question: (CO 1) Among 500 people at the concert, a survey of 35 found 28% found it too loud. What is the population and what is the sample? 2. Question: (CO 1) In asking all 349 second graders in a school district, it is found that on average, these second graders have 2.5 pets. Is this number a parameter or a statistic and why? 3. Question: (CO 1) Classify the data of all the political parties in the world. 4. Question: (CO 1) The data set that lists the temperatures in Albany, NY each d...

MATH221 Final Exam(Latest Quest & Ans)MATH221 Final Exam(Latest Quest & Ans)

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...

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...

1. Question: Given the following information, find the probability that a randomly selected student will be very short. Number of students who are very short: 45, short: 60, tall: 82, very tall: 21 2. Question: Given the following information, find the probability that a randomly selected dog will not be a golden retriever. Number of dogs who are poodles: 31, golden retrievers: 58, beagles: 20, pugs: 38 3. Question: Given that there is a 22% chance it will rain on any day, what is the probabil...

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, ...

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, ...