How do the average weekly incomes of electricians and carpenters compare? A random sample of 17 regions in the United States gave the following information about average weekly income (in dollars). (Reference: U.S. Department of Labor, Bureau of Labor Statistics.) Region 1 2 3 4 5 6 7 8 9 Electricians 469 715 596 464 738 693 748 573 809 Carpenters 544 817 511 474 681 505 786 659 478 Region 10 11 12 13 14 15 16 17 Electricians 592 596 706 574 865 597 597 652 Carpenters 487 643 678 381 818 607 555 507 Does this information indicate a difference (either way) in the average weekly incomes of electricians compared to those of carpenters? Use a 10% level of significance. (a) What is the level of significance? (b) Compute the sample test statistic. (Use 2 decimal places.) (c) Find the P-value of the sample test statistic. (Use 4 decimal places.)

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Given the following data set: $1.42, $1.27, $1.28, $1.48, $1.36, $1.44, $1.46, $1.32, $1.33, $1.33 $1.23, $1.38, $1.43, $1.28, $1.43, $1.49, $1.37, $1.26, $1.26, $1.38 Determine the frequencies of gasoline prices for each given class. Frequency Relative Frequency Class < $1.25 $1.25 < $1.30 $1.30 $1.35 $1.35 $1.40 $1.40 < $1.45 $1.45 CHECK ANSWER

The accompanying table contains historical data on staff salaries​ (in dollars per​ pupil) for 30 schools sampled in part of a country in the early 1970s. I need help with this part attached. 3.86 2.80 2.71 2.95 3.08 1.802.60 3.32 2.52 2.12 2.58 2.682.76 2.85 3.67 3.84 3.43 2.122.94 2.83 3.04 2.43 2.18 3.693.21 3.67 2.39 2.61 3.42 3.45 The sample mean is 2.9183 The sample standard deviation is 0.5495

How productive are U.S. workers? One way to answer this question is to study annual profits per employee. A random sample of companies in computers (I), aerospace (II), heavy equipment (III), and broadcasting (IV) gave the following data regarding annual profits per employee (units in thousands of dollars). I II III IV 27.6 13.6 22.1 17.7 23.9 9.8 20.4 16.6 14.5 11.6 7.1 14.2 8.9 8.9 12.9 15.1 11.7 6.8 7.8 10.5   19.9   9.5 Shall we reject or not reject the claim that there is no difference in population mean annual profits per employee in each of the four types of companies? Use a 5% level of significance. (a) What is the level of significance?State the null and alternate hypotheses. Ho: ?1 = ?2 = ?3 = ?4; H1: Exactly two means are equal.Ho: ?1 = ?2 = ?3 = ?4; H1: Exactly three means are equal.    Ho: ?1 = ?2 = ?3 = ?4; H1: Not all the means are equal.Ho: ?1 = ?2 = ?3 = ?4; H1: All four means are different. (b) Find SSTOT, SSBET, and SSW and check that SSTOT =…

1. Determine the mean, midrange, and mode of the following data: 12, 13, 11, 10, 12, 11, 11, 14

what is the percentile rank of 40? explain your answer please.

double check + help

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Consumer Research, Inc.   Consumer Research, Inc., is an independent agency that conducts research on consumer attitudes and behaviors for a variety of firms. In one study, a client asked for an investigation of consumer characteristics that can be used to predict the amount charged by credit card users. The following data were collected on annual income, household size, and annual credit card charges for a sample of 50 consumers.   Managerial Report     Use methods of descriptive statistics to summarize the Comment on the findings.     Develop estimated regression equations, first using annual income as the independent variable and then using household size as the independent variable. Which variable is the better predictor of annual credit card charges? Discuss your findings.     Develop an estimated regression equation with annual income and household size as the independent Discuss your findings.     What is the predicted annual credit card charge for a three-person…