A professional golfer is shopping for a new brand of golf ball. She likes most of the features of one particular brand, but she wants to make sure that the brand has a desirable spin rate (the rate at which the ball spins on its axis after being struck by a golf club). To test the spin rate of this new brand of ball, the golfer hits the brand of ball on 100 shots, and a computer measures the spin rate for each shot. The computer then produces the following histogram summarizing the 100 spin rates. Relative frequency 0.3. 0.2 0.10 0.1+ 0.09 0.0- 5000 5500 6000 0.24 0.24 0.22 6500 0.11 7000 7500 8000 Spin rate (in revolutions per minute) Based on the histogram, find the proportion of spin rates in the sample that are greater than or equal to 7000 revolutions per minute. Write your answer as a decimal, and do not round your answer. ☐ X

Twenty five right-handed students were asked to turn a knob (using their right hands) that moved an indicator by screw action. There were two identical instruments, one with a right-hand thread (the knob turns clockwise) and the other with a left-hand thread (the knob turns counterclockwise). The data presented below gives the times (in seconds) each subject took to move the indicator a fixed distance: Obs. # R 1 2 13 14 15 6 113 105 130 101 138 118 87 IL Obs. #R 137 18 105 9 133 10 108 11 115 12 170 13 103 14 IL |Obs. # |R 116 145 15 118 75 78 16 103 96 107 17 |111 123 122 184 18 104 135 103 148 19 111 112 | 116 147 120 89 193 107 187 121 178 176 1. Test Stat (round off final answer to 4 decimal places) 2. Critical Region: Select one: a. T>abs(2.492) b. T2.492 d. T>abs(2.492) Obs. # R IL 166 22 146 23 100 At 1% level of significance, can we conclude that these right-handed students found it easier to use the knobs with a right-hand thread? Use the following form of the difference:…

#14- psych stats : show full work (last one did it wrong)

Find the value of m, b, and A so that f fits the data.

aylor Swift wants to know the proportion of her fans who listened to her new single ME! within the first hour of it being released.  In order to estimate this, she takes a sample of 150 of her fans and asks them if they listened to the song in this time period.  Of the 150 fans, 135 of them (90%) responded that they did listen to the song during this time period.  What is the parameter and what is its value?     a. The parameter is the proportion of the 150 sampled Taylor Swift fans who listened to ME! within the first hour after it released, which is 135.       b. The parameter is the group of Taylor Swift fans who were surveyed, which is 150.       c. The parameter is the proportion of all Taylor Swift fans who listened to ME! within the first hour after it released, which is unknown.   d. The parameter is the proportion of all Taylor Swift fans who listened to ME! within the first hour after it released, which is 0.9.       e. The parameter is the…

John was calculating the peeds (mph) of vehicles traveling down Maple Street on two separate days at 9 am for an hour. Below is the data she collected. Wednesday's speeds: 32,28,24,17,39,44,64,33,27,21,38,40,60,30,25,37,30,25,35,30 Sunday's speeds: 18,27,34,37,49,55,63,61,48,30,27,17,17,15,26,46,25 1. Calculate the mean and median of each day. 2. Calculate the five-number summary of each day. a. Wednesday's Five-Number Summary. b. Sunday's Five-Number Summary. 3. Test each day for outliers. If they have outliers, identify them and adjust the five-number summary to reflect the outlier. (Remember to find IQR and then Upper and Lower Limits) a. Wednesday's Outlier Test b. Sunday's Outlier Test 4. Create a stacked box-and-whisker plot using the five-number summaries from Wednesday and Sunday. 5. What do you notice about the box-and-whisker plots? Describe the spread in each specifically.

If we performed a t-test, how many people would be in the study based on the regression model in photo.

Copper wires are coated with a thin plastic coating. Samples of four wires are taken every hour, and the thickness of the coating (in mils) is measured. The data from the last 30 samples are presented in Table E12 on page 795. The means are X= 150.075, R= 6,97, and -3.082. a. Compute the 30 limits for the R chart. Is the variance out of control at any point? If so, delete the samples that are out of control and recompute y and R. b. Compute the 3ơ limits for the X chart. On the basis of the 30 limits, is the process mean in control? If not, at what point is it first detected to be out of control? C. On the basis of the Western Electric rules, is the process mean in control? If not, when is it first detected to be out of control? TABLE E12 Data for Exercise 12 Sample Sample Values 147.4 151.9 146.0 155.2 150.125 9.2 4.22 2 147.1 147.5 151.4 149.4 148.850 4.3 1.97 3 148.7 148.4 149.6 154.1 150.200 5.7 2.65 151.3 150.0 152.4 148.2 150.475 4.2 1.81 146.4 147.5 152.9 150.3 149.275 6.5 2.92…

Industrial experiment Engineers at a computer produc-tion plant tested two methods for accuracy in drilling holes into a PC board. They tested how fast they couldset the drilling machine by running 10 boards at each oftwo different speeds. To assess the results, they measuredthe distance (in inches) from the center of a target on theboard to the center of the hole. The data and summarystatistics are shown in the table: Write a report summarizing the findings of the experi-ment. Include appropriate visual and verbal displays of the distributions, and make a recommendation to theengineers if they are most interested in the accuracy ofthe method.

Roy ‘s Texaco wants to keep the price of its unleaded gasoline competitive with that of other stations in the area. Roy’s is currently charging $1.29 per gallon. To check that the average price for this gasoline for all stations within a 15 mile radius is higher than his price, Roy randomly samples the price of unleaded gasoline at ten stations located in this area. He obtains the following data for the price per gallon (in dollars): 1.7, 1.5, 2.6, 2.2, 2.4, 2.3, 2.6, 3.0, 1.4, 2.3 Set up the appropriate hypotheses and test them using a significance level of α= .05