Joseph is statistics instructor. He is interested in seeing if his fall class or spring class tends to do better. Below are the data for Joseph's classes in 2003. Fall: 87 76 99 65 82 90 80 Spring: 92 88 74 60 88 77 82 What is the value of the test statistic associated with these data? a. .333 b..0174 O c. -28.13 O d. -0.442

In the following situation we want to compare the mean responses in several populations.Are you a morning person, an evening person, or neither? Does this personality trait affect how well you perform? A sample of 111 students took a psychological test that found 17 morning people, 35 evening people, and 59 who were neither. All the students then took a test of their ability to memorize at 8 a.m. and again at 9 p.m. You analyze the score at 8 a.m. minus the score at 9 p.m. Give k, the ni, and N?

Professor Pete’s calculus class has the following scores: 19   21   31   32   37   45   52   55   62   63   63   65   65   77   78 Use Excel to find the mean. (round to the nearest whole number)

5. For 2019, the mean fare to fly from Los Angeles to Miami was $250 on Aero Lindvallia. In December 2021, nine flights were randomly surveyed resulting in the following ticket price data being recorded: $ 321 $ 280 24 $ 286 $ 299 $310 $ 275 $ 250 $ 270 $ 281 The numbers above can be copied & pasted directly into Microsoft Excel®. a. What test would you use to determine if the ticket prices had gone up or down? Is it a one-tailed or two-tailed test? Explain. b. Calculate the necessary statistics to perform that test. c. Using the 6-step hypothesis testing procedure, perform the test that you described above. Use a level of significance of 0.01. Comment on each step of the 6-step hypothesis testing procedure; especially explain why a t-distribution must be used. d. Compute the p-value. Would the results of the hypothesis test change if the level of significance was 0.05? se ecA u

Assume you get a new job as a coach for a sports team, and one of your first decisions is to choose the sports drink that the team will use during practices and games. You obtain a Sports Report magazine so you can use your statistical background to help you make the best decision. The following table lists the most popular sports drinks and some important information about each. Answer the following questions about the table.   Drink Calories Sodium Potassium Cost Gatorade 60 110 25 $1.29 Powerade 68 77 32 $1.19 All Sport 75 55 55 $0.89 10-K 63 55 35 $0.79 Exceed 69 50 44 $1.59 1st Ade 58 58 25 $1.09 Hydra Fuel 85 23 50 $1.89 Do all the costs per container fall inside the confidence interval?  If not, which ones do not? (show the work)

HISTOGRAM: 3. The following is the IQ scores for 40 randomly chosen fifth graders in 2012. 108 113 12699 117 119|102 109 129 109 130112 81 13890 105 80 123 100 135 140 103 133 127 139 99 114129|108 132118 113 114 128 110 98 127 120 93 85 A. What type of data is this (Categorical or Numerical)? Use the calculator to help you draw a histogram for this IQ data. Full detail steps for using the Ti-83/84 calculator to draw a histogram given in the Chapter 11 notes. B. Enter the fifth grades IQ Scores data into List 1 (L1). C. Using STAT PLOT menu set up your calculator to draw a histogram.

In the following situation we want to compare the mean responses in several populations.Are you a morning person, an evening person, or neither? Does this personality trait affect how well you perform? A sample of 111 students took a psychological test that found 17 morning people, 35 evening people, and 59 who were neither. All the students then took a test of their ability to memorize at 8 a.m. and again at 9 p.m. You analyze the score at 8 a.m. minus the score at 9 p.m. Give the degrees of freedom of the ANOVA F test. numerator df =  denominator     df =

In the class poll from the beginning of the year, you were asked what color car you drive. The results are summarized below. aqua 3 beige/tan/gold 39 black 80 blue 44 green 21 orange 3  pink 1 purple 3 red 45 silver 63 white 74 yellow 1 What is the mode for this data set?

Textbook example

Which one would be the answer?