IF the mean of five observations is 8 and devietions of these observations about their mean ave -2,3,-5,0,4 Then the va lue of secound abservation is :
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- The average American gets a haircut every 35 days. Is the average smaller for college students? The data below shows the results of a survey of 13 college students asking them how many days elapse between haircuts. Assume that the distribution of the population is normal. 39, 37, 36, 37, 36, 37, 38, 40, 33, 40, 27, 25, 41 What can be concluded at the the αα = 0.01 level of significance level of significance? For this study, we should use The null and alternative hypotheses would be: H0:H0: H1:H1: The test statistic = (please show your answer to 3 decimal places.) The p-value = (Please show your answer to 3 decimal places.) The p-value is αα Based on this, we should the null hypothesis.The extract of a plant native to Taiwan has been tested as a possible treatment for Leukemia. One of the chemical compounds produced from the plant was analyzed for a particular collagen. The collagen amount was found to be normally distributed with a mean of 73 and standard deviation of 5.4 grams per milliliter.For each of the following answers have at least 4 decimal digits of accuracy. What percentage of compounds formed from the extract of this plant fall within 1 standard deviations of the mean?In the following table x is a random variable representing the number of trees per mile of road on randomly selected streets with a 25 mph speed limit in a major city while y represents the average speed of cars in mph sampled over a one-hour period at the same time of day. X 45 1.0 25 15 30 20 50 40 45 25 ) Draw a Scatter Diagram of the data. Remember to label the axes appropriately and choose a consistent scale. ^ Based on the scatter diagram, would you estimate the correlation coeffici positive, close to zero, or negative?
- Show all work/steps! You must use JMP to analyze data.Two independent groups of students were selected to participate in a study to determine if having video lectures in an online class has an effect on test scores. The students were randomly (SRS) placed into 2 groups, one group was the online class of 30 students with video lectures and the other group was the online class of 33 students without video lectures. The average test score on the online class of 30 students with video lectures was x-bar: 87 with a standard deviation of s = 1.8 and the average test score the online class of 33 students without video lectures x-bar = 86 with a standard deviation of s = 3.2. Is there enough evidence at the 1% level that the test scores of the online class with video lectures are higher than the test scores of the online class without video lectures? Set up the hypothesis testing: a) Ho: u1 = u2 The average test scores of the online class with video lectures are equal to the average test scores of the online class without video lectures. Ha: u1…Suppose the length of time a person takes to use an ATM machine is normally distributed with mean u = 110 seconds and standard deviation o = 6 seconds. There aren = 4 people ahead of Jackson in a line of people waiting to use the machine. He is concerned about T = total time the four people will take to use the machine. n USE SALT (a) What is the mean value, u, of T = total time for the four people ahead of Jackson? (b) Assuming that the times for the four people are independent of each other, determine the standard deviation of T. (c) Jackson hopes the total time T is less than or equal to 404 seconds. Find P(T < 404), the probability that the total waiting time is less than 404 seconds. (Round the answer to four decimal places.) P(T < 404) =
- Two independent groups of students were selected to participate in a study to determine if having video lectures in an online class has an effect on test scores. The students were randomly (SRS) placed into 2 groups, one group was the online class of 30 students with video lectures and the other group was the online class of 33 students without video lectures. The average test score on the online class of 30 students with video lectures was x-bar: 87 with a standard deviation of s = 1.8 and the average test score the online class of 33 students without video lectures x-bar = 86 with a standard deviation of s = 3.2. Is there enough evidence at the 1% level that the test scores of the online class with video lectures are higher than the test scores of the online class without video lectures? State the conclusion: a) We do not reject Ho. There is not statistical significant evidence to reject Ho. The average test scores of the online class with video lectures are not greater than the…An XYZ is hiring this school year's HRM graduate students from university ABC. The average height of the HRM students is 163 cm with a standard deviation of 5.6 cm with 100 randomly selected students. All students whose height is the tallest 15% will qualify to the first screening of hiring, determine the minimum height to qualify. 4 decimal places.Consider the following set of three distributions, all of which are drawn to the same scale. Identify the two distributions that are normal. Of the two normal distributions, which one has the larger variation? Q 9 The two normal distributions are Ar 1. ^. where Ar 1) and (2) and (c) P) and (4) has the larger standard deviation.
- Two independent groups of students were selected to participate in a study to determine if having video lectures in an online class has an effect on test scores. The students were randomly (SRS) placed into 2 groups, one group was the online class of 30 students with video lectures and the other group was the online class of 33 students without video lectures. The average test score on the online class of 30 students with video lectures was x-bar: 87 with a standard deviation of s = 1.8 and the average test score the online class of 33 students without video lectures x-bar = 86 with a standard deviation of s = 3.2. Is there enough evidence at the 1% level that the test scores of the online class with video lectures are higher than the test scores of the online class without video lectures? What is set up work for this problem?: a) x-bar1 = 87, s1 = 1.8, n1 = 30, x-bar2 = 86, s2 = 3.2, n2 = 33, SE = 0.6468, z score = (87-86)/0.6468 = 1.55, p-value = 0.128 b) x-bar1 = 87, s1 = 1.8, n1 =…It seem e days that college graauates wno are employea TUII-time work more than 40-nour weeks. Data are avallable that can nelp us decide ir this is true. A survey wus recently sent to a group of adults selected at random. There were 12 respondents who were college graduates employed full-time. The mean number of hours worked per week by these 12 respondents was 42 hours, with a standard deviation of 10 hours. Assume that the population of hours worked per week by college graduates employed full-time is normally distributed with mean u. Can we conclude that u is greater than 40 hours? Use the 0.05 level of significance. Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places and round your answers as specified in the table. (If necessary, consult a list of formulas.) (a) State the null hypothesis H and the alternative hypothesis H,. p Ho :0 H :0 (b) Determine the type of test statistic to use. D=0 OSO (c) Find the…