1. fast please Questions 1 – 3 refer to the following: A physical therapist wanted to know whether the mean pulse of men was less than the mean pulse of women. She randomly selected 70 women and 51 men to participate in her study. Each subject was required to step up and down onto a 6-inch platform for 3 minutes. She obtained the following results:                           Sample size Sample mean Sample standard deviation Men 51 112.3 11.3 Women 70 118.3 14.2 This is a test of: Group of answer choices Matched pairs Two proportions Two means, population standard deviation known. Two means, population standard deviation unknown.

Given the following dataset of the price of a gallon of gas: $2.85; $3.06; and $2.99. Calculate the sample variance. The sample variance, rounded off as instructed, is:

Exhibit 2 The management of a department store is interested in estimating the difference between the mean credit purchase of customers using the stores credit card versus those customers using a national major credit card. You are given the following information:    STORES CARD MAJOR CREDIT CARD Sample Size  75 52 Sample Mean $185 $150 Sample Std Dev $12 $8 Q21a = Refer to Exhibit 2. A Point estimate for the difference between the mean purchases of the users of the two credit cards is:

Students in an experimental psychology class did research on depression as a sign of stress. A test was administered to a sample of 30 students. The scores are given. Complete parts (a) through (c) below. 32 54 11 15 35 21 OA. 158 34 15 55 51 11 35 2 1457 3 1234567 4123445566 511245666 34 33 46 OB. 11155 (a) Find the mean and median of the data. The mean is . (Round to three decimal places as needed.) 44 26 27 The median is .(Type an integer or a decimal.) (b) Draw a stem-and-leaf plot for the data using one row per stem. Which stem-and-leaf plot below shows the data? 2 112677 3 233445556 4 244666 5 1456 ... 21 42 38 OA. The distribution is symmetric. B. The distribution is skewed right (positively skewed). OC. The distribution is skewed left (negatively skewed). O D. The distribution is uniform. (c) Describe the shape of the distribution. Which description below best describes the shape of the distribution? 56 46 OC. 1112455668 2 14556 3 15 4 13457 5 223446667 46 27 33 35 22 44 36 0…