A typing school claims that in a six-week intensive course, it can train students to type, on the average, at least 60 words per minute. A random sample of 15 graduates is given a typing test and the median number of words per minute typed by each of these students is given below. Test the hypothesis that the median typing speed of graduates is at least 60 words per minute. WPM-60 di Students Words per minute A 81 +21 В .76 +16 C 53 - 7 71 +11 E 66 + 6 F 59 - 1 G 88 +28 H. 73 +13 80 +20 J 66 + 6 K. 58 - 2 70 +10 M 60 N 56 - 4 55 - 5 S = 5

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A manufacturing plant makes computer chips 24 hours a day. Employees work one of three, 8 hour shifts during the morning (2am-10am), day (10am-6pm), and night (6pm-2am). Below are data on the number of defective chips on a randomly chosen 24 hour period. Shift Morning Day Night Number of Defective Chips 23 26 47 Total Chips Manufactured 330 330 330 The plant manager thinks there might be more defective computer chips manufactured during the night shift compared to the day shift. Give appropriate statistical evidence to test the managers' claim.

If Study determines the difference an average salaries are so population of people with blue eyes and people with brown eyes is not significant than a population of blue are people in brown and people are ______ different salaries.

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Blood type and survival rate - In early 2020, medical researchers in China investigated the association between blood type (A, B, AB and O) and severity of COVID-19 symptoms. The researchers collected information about blood type from patients in Jinyintan hospital in Wuhan, China, in January 2020. The table below summarizes the information for a sample of 867 patients from this investigation. COVID patients Survived Died Total Blood Type A 285 42 327 Blood Type B 204 25 229 Blood Type AB 78 9 87 Blood Type O 199 25 224 Total 766 101 867 Round all answers to 4 decimal places. 1. What proportion of these COVID-19 patients had blood type AB? 2. What proportion of these COVID-19 patients died? 3. If we randomly selected one of these patients, what is the probability the patient both had blood type A and survived? 4. What is the probability a randomly selected COVID-19 patient from this sample with blood type AB died?