Math221 Study guides, Class notes & Summaries

1. Question: Let x represent the number of pets in pet stores. This would be considered what type of variable: 2. Question: Let x represent the number of players on a sports field. This would be considered what type of variable? 3. Question: Consider the following table. If you created the probability distribution for these data, what would be the probability of 30-39? 4. Question: Consider the following table. Find the mean of this variable. 5. Question: Consider the following table. Find ...

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 8.54 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, ...

Statistics for decision making week 3 quiz chapters 1,2,& 3 Question 1 2 / 2 pts (CO 1) A survey of 128 DeVry statistics students found that 83% read the announcements each week. What is the population and what is the sample? Question 2 0 / 2 pts (CO 1) The measurements of 100 products from the assembly line show that 99% are correct. Is this percentage a parameter or a statistic and why? Question 3 2 / 2 pts (CO 1) Classify the data of the heights of ladders produced by a tool company. Ques...

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 5 minutes to select a shoe purchase. Is this outcome unusual? 2. Question: In a health club, research shows that on average, patrons spend an average of 42.5 minutes on the treadmill, with a standard deviation of 4.8 minutes. It is assumed that this is a ...

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...

1. Question: A recent survey of the alumni of the university indicated that the average salary of 10,000 of its 200,000 graduates was $130,000. The $130,000 would be considered a: 2. Question: In a survey of 1000 adults, 34% they found to be preferred charcoal to gas grills. The 1000 would be considered a: 3. Question: The average age of students in a statistics class is 28 years. The 28 years would be considered an example of: 4. Question: The ages of 20 first graders would be considered: 5...

1. Question: (CO 3) The speed of cars on a stretch of road is normally distributed with an average 48 miles per hour with a standard deviation of 5.9 miles per hour. What is the probability that a randomly selected car is violating the speed limit of 50 miles per hour? 2. Question: (CO 3) A survey indicates that shoppers spend an average of 22 minutes with a standard deviation of 16 minutes in your store and that these times are normally distributed. Find the probability that a randomly selecte...