Math 221 - Study guides, Class notes & Summaries

Question 1 2 / 2 pts 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 standard deviation of 3.54. What is the 95% confidence interval for the amount of time spent on administrative issues? (19.24, 24.14) (16.99, 24.07) (13.45, 27.61) X (19.62, 21.44) Question 2 2 / 2 pts 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 maximum error? X9...

Question 1 2 / 2 pts Let x represent the height of first graders in a class. This would be considered what type of variable: Discrete Continuous Nonsensical Lagging Question 2 2 / 2 pts Let x represent the height of corn in Oklahoma. This would be considered what type of variable: Continuous Discrete Inferential Distributed IncorrectQuestion 3 0 / 2 pts Consider the following table. Age Group Frequency 18-29 9831 30-39 7845 40-49 6869 50-59 6323 60-69 5410 70 and over 52...

Question 1 2 / 2 pts 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 standard deviation of 3.54. What is the 95% confidence interval for the amount of time spent on administrative issues? (19.24, 24.14) (16.99, 24.07) (13.45, 27.61) X (19.62, 21.44) Question 2 2 / 2 pts 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 maximum error? X9...

Let x represent the number of pets in pet stores. This would be considered what type of variable: Discrete Nonsensical Lagging Continuous Flag this Question Question 22 pts Let x represent sheets of paper in a package. This would be considered what type of variable: Discrete Continuous Inferential Distributed Flag this Question Question 32 pts Consider the following table. Age Group Frequency 18-29 9831 30-39 7845 40-49 6869 50-59 6323 60-69 5410 70 and over 5279 If you c...

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% confid ence interval for the amount of time spent on administrative issues? (13.45, 27.61) (19.24, 24.14) (16.99, 24.07) (19.62, 21.44) 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 ...

MATH 221 Week 3 Quiz: Statistics for Decision-Making (v5) Question: (CO 1) A survey of 385 people who like wild sweaters found that 74% had a wild holiday sweater. What is the population and what is the sample? Question: (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: (CO 1) Classify the data of the number of customers at a restaurant. Question: (CO 1) The data set that lists the runs score...

MATH 221 Week 6 Homework: Statistics for Decision-Making (May 2021) Question: A consumer analyst reports that the mean life of a certain type of alkaline battery is more than 63 months. Write the nul l and alternative hypotheses and note which is the Question: An amusement park claims that the average daily attendance is at least 20,000. Write the null and alternative hypotheses and note which is the claim. Question: Type I and type II errors occur because of what issue within the hypothesis tes...

MATH 221 Week 7 Quiz: Statistics for Decision-Making (v1) 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? Question: (CO 4) If a confidence interval is given from 8.56 to 10.19 and the mean is known to … 9.375, what is the margin of error? Question: (CO 4) If the popula...

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 random ly selected car is violating the speed limit of 50 miles per hour? 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 selected shop...