The following data represent the pulse rates (beats per minute) of nine students enrolled in a statistics course. Treat the nine students as a population. Complete parts (a) through (c). Student Perpectual Bempah Megan Brooks Jeff Honeycutt Clarice Jefferson Crystal Kurtenbach Janette Lantka Kevin McCarthy Tammy Ohm Kathy Wojdya Pulse D 79 86 84 86 69 86 75 78 88 (a) Determine the population mean pulse. The population mean pulse is approximately beats per minute. (Round to one decimal place as needed.) (b) Determine the sample mean pulse of the following two simple random samples of size 3. Sample 1: (Megan, Kathy, Janette) Sample 2: (Tammy, Kevin, Crystal) The mean pulse of sample 1 is approximately beats per minute. (Round to one decimal place as needed.) The mean pulse of sample 2, is approximately beats per minute. (Round to one decimal place as needed.) (c) Determine if the means of samples 1 and 2 overestimate, underestimate, or are equal to the population mean. The mean pulse rate of sample 1 The mean pulse rate of sample 2 the population mean. the population mean.

Find the 25th, 50th, and 75th percentile from the following list of 25 observations. 12 17 24 25 26 27 43 45 49 50 52 53 55 68 70 72 76 80 84 88 90 92 93 96 100 25th percentile =  50th percentile =  75th percentile =

Given below are the ages of motorcyclists at the time they were fatally injured in traffic accidents (based on data from the U.S. Department of Transportation).          18   38   23   14   18   34   16  42   28           24   40   20   23   34   37   21  32   25           17   28   33   25   23   19   51  18   29 Looking at the histogram for the data, what is the height (frequency) of the 4th bar on the histogram? Given below are the ages of motorcyclists at the time they were fatally injured in traffic accidents (based on data from the U.S. Department of Transportation).          18   38   23   14   18   34   16  42   28           24   40   20   23   34   37   21  32   25           17   28   33   25   23   19   51  18   29 Looking at the histogram for the data, what is the height (frequency) of the 4th bar on the histogram? 4 7 5 6 8

The number of hospital beds in a sample of 20 hospitals is shown below. Construct a frequency distribution and a frequency histogram for the data set using 5 classes. Describe the shape of the histogram as symmetric, uniform, negatively skewed, positively skewed, or none of these. 166 159 132 125 185 163 165 216 145 135 D 199 210 152 250 262 241 285 139 205 179 Construct a frequency distribution for the data set using 5 classes. (Type whole numbers.) Class Frequency 125-157 158–190 191-223 224-256 257-289 Construct a frequency histogram for the data set using the frequency distribution. Choose the correct answer below. O A. OB. О с. OD. Hospital Beds Hospital Beds Hospital Beds Hospital Beds 8- 8- * 6- - 2- E 2+ 0+ 108 174 240 306 0+ 108 174 240 306 0+ 108 174 240 306 0+ 108 174 240 306 Numhar of harde Numhar of hade Numher nf hede Numher of hede Aou anbai Frequency Frequency

Two-Way Frequency Tables Practice 1. The students in a seaside school will have to take extra swimming lessons if they cannot swim. The table below gives information about the students in grades 7, 8 and 9. Can swim Cannot Total swim Grade 7 120 60 180 179 Grade 8 168 11 Grade 9 172 3. 175 74 534 Total a. Complete the table. 74 b. How many students need swimming lessons?. 179 c. How many students are there in 8th grade? d. How many of the 7th grade students cannot swim? (00 e. How many students in grades 7 and 8 can swim? 288 f. How many students are there altogether in grades 7, 8, and 9? 534 g. What is the probability that a student is a 7th grader? 32 h. What is the probability that a student is an 8th grader and can swim to all 8th graders? A 33 i. What is the probability that a student cannot swim? 14

(a) Determine the population mean pulse. The following data represent the pulse rates (beats per minute) of nine students enrolled in a statistics course. Treat the nine students as a population. Complete parts (a) through (c). The population mean pulse is approximately beats per minute. (Round to one decimal place as needed.) Student Pulse O Perpectual Bempah 76 Megan Brooks Jeff Honeycutt 80 85 Clarice Jefferson 75 Crystal Kurtenbach 60 Janette Lantka 64 Kevin McCarthy 79 Tammy Ohm 80 Kathy Wojdya 84

Data was collected for 300 fish from the North Atlantic. The length of the fish (in mm) is summarized in the GFDT below.   Lengths (mm)      Frequency    220 - 229 1 230 - 239 16 240 - 249 71 250 - 259 108 260 - 269 83 270 - 279 18 280 - 289 3 What is the upper class limit for the seventh class?

435 507 448 435 463 440 448 413 432 458 473 465 428 472 439 a. Summarize the data on femur lengths in a frequency table. Use class intervals that start at 400 and have width 20. b. Add a column to your table from part (a) for the relative frequencies. c. Draw a histogram that represents your frequency table. (Use either frequency or relative frequency for the vertical axis.)

Ms. Garcia gave her students a biology test last week. Here are the test scores for each of the sixteen students. 83 79 78 82 77 81 Test scores 80 78 Send data to calculator Test scores 71.5 to 75.5 75.5 to 79.5 79.5 to 83.5 (a) Complete the grouped frequency distribution for the data. (Note that the class width is 4.) 83.5 to 87.5 87.5 to 91.5 86 X 90 85 74 84 74 73 89 Frequency S (b) Using the classes from part (a), draw the frequency polygon for the data. Note that you can add or remove classes from the figure. Label each class with its midpoint. Frequency 4+ 3+ 2+ L Test scores 0:00 00:0 X ? 10 A 8 Aa

In California, they need more rain to sustain the health of the natural environment, state argriculture, and state economy. A group of statistics students in Oxnard College recorded the amount of rain during 2016-2017 school year, measuring the intensity by the inches of rain, and the results were: Daily Rain Amounts Inches of Rain 1 2 3 4 5 6 Frequency 7 6 6 3 2 1 The mean rain intensity: ________inches (Please show your answer to 1 decimal place.) The median rain intensity: _______inches The mode rain intensity: _______inches Please separate your answers by a comma if there is more than one mode.