MATH IV 2 ND 9 WEEKS DAILY WARM UPS Oct 14 th – Oct 31 st

The Central Limit Theorem states that if samples of size thirty or higher are drawn from any population with a mean and standard deviation, then the sampling distribution of sample means approximates a normal distribution and the larger the sample size, the closer the result is to ____________________. (MM4D1) a) the true population mean b) the true sample standard deviation c) the true sample size. d) the true population standard deviation. Oct 14, 2013

Fifty recent tests of an automobile’s mileage indicate it averages 21 mi/gal with standard deviation 1.8 mi/gal. Assuming the distribution is normal, find the 99% confidence interval. (MM4D2) Oct 15, 2013

Oct 16, 2013 Given the following information concerning IQ scores: µ =100 and σ =15 Using the Empirical Rule what % fall between the scores 70 and 115? (MM4D1)

Suppose that a quality control manager wishes to measure the average amount of cleaning fluid that is placed in their 12 ounce bottles. How large a sample must be taken in order to be 95% confident that the sample mean is within.05 ounces of the population mean given that = 0.3 (MM4D2) OCT 18 TH, Video on creating baseball bats. Oct 17, 2013

1.) The z-value corresponding to a number below the mean is _____________________________. 2.) In a particular study, teenagers were polled on the average number of hours per week they work. A 95% confidence level was found to be (15.8, 21.2 ). Interpret the finding. (MA3D2) (Choose the best statement.) a) We are 95% confident that the true population mean of the number of hours worked by a teenager per week is found somewhere between 15.8 hours and 21.2 hours per week. b) We are confident that 95% of teenagers work between 15.8 and 21.2 hours per week. c) We are 95 % confident that the average number of teenagers that work per week is between 15.8 and 21.2 teenagers. Oct 21, 2013

In the city of Marietta, Georgia, 35% of all Ipods sold were the color white in one particular month. If a random sample of 14 stores were polled find the 99% confidence interval for the population of white Ipods sold. (assume normal distribution) (MA3D2) Oct 22, 2013

A pharmaceutical company claims that its antacid contains an average of 295 mg of its active ingredient in each tablet with a standard deviation of mg. Students in a chemistry class analyzed 35 tablets to determine the amount of active ingredient. What is the probability that a sample will have a mean greater than ? (MM4D1) Oct 23/28, 2013 Oct 24 th – Mrs. Meadows out Oct 25 th – Quiz Oct 26 th – Video: Science on Mars

Oct 29, 2013

Oct 30 th : Test Oct 31 st : No warm up Oct 30, 2013