Math221 - Study guides, Class notes & Summaries

Course pack chapter 1.1 & 1.2: Precalculus Review Supplement Examples

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: Two variables have a negative linear correlation. Does the dependent variable increase or decrease as the independent variable increases? 2. Question: What does the variable µ represent? 3. Question: A golfer wants to determine if the type of driver she uses each year can be used to predict the amount of improvement in her game. Which variable would be the response variable? 4. Question: Two variables have a positive linear correlation. Is the slope of the regression line betwee...

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, ...

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: 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: 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: 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: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...