b) Given the following data: Month Sales Month Sales July August September 38.0 October 35.0 January February March 25.0 31.0 32.0 29.0 April May June 33.0 40.0 November 37.0 December 32.0 34.0 37.0 Required: • With a six-month warm-up sample, determine monthly forecasts using: i. ii. Naïve Model Three-month Moving Average Weighted Average Exponential Smoothing ( a = 0.40) Linear Regression ii. iv. V. • For each models above, calculate: i. ii. MAD MSE With MSE as basis, which of the models do you think is superior?
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- a) Is the dealer's mean significantly greater than the national average of 30,043 miles for 2-year leases? Using the 10 percent level of significance, choose the appropriate hypothesis. H0: μ ≤ 30,043 miles vs. H1: μ > 30,043 miles, reject H0 if tcalc > 1.3250 H0: μ ≥ 30,043 miles vs. H1: μ > 30,043 miles, reject H0 if tcalc > 1.3250 H0: μ ≤ 30,043 miles vs. H1: μ < 30,043 miles, reject H0 if tcalc > 1.3250 H1: μ ≤ 30,043 miles vs. H0: μ > 30,043 miles, reject H0 if tcalc > 1.3250 d a b c (b) Calculate the test statistic. (Round your answer to 2 decimal places.) Test statistic ________ (c) The dealer's cars show a significantly greater mean number of miles than the national average at the 10 percent level. No YesWhen a population distribution is moderately skewed, unimodal, without outliers?in statistical inference, a sample ............ is referred to as the point estimator of the corresponding population parameter.
- A statistical program is recommended. Jensen Tire & Auto is in the process of deciding whether to purchase a maintenance contract for its new computer wheel alignment and balancing machine. Managers feel that maintenance expense should be related to usage, and they collected the following information on weekly usage (hours) and annual maintenance expense (in hundreds of dollars). Weekly Usage(hours) AnnualMaintenanceExpense 13 17.0 10 22.0 20 30.0 28 37.0 32 47.0 17 30.5 24 32.5 31 39.0 40 51.5 38 40.0 #1) Develop the estimated regression equation that could be used to predict the annual maintenance expense (in hundreds of dollars) given the weekly usage (in hours). (Round your numerical values to two decimal places.) #2) The expected expense of a machine being used 34 hours per week is $ hundred.Explain the Holt-Winter and Brown forecasting techniqueThe Tampa Bay (Florida) Area Chamber of Commerce wanted to know whether the mean weekly salary of nurses was larger than that of school teachers. To investigate, they collected the following information on the amounts earned last week by a sample of school teachers and nurses. School Teachers ($) 1,095 1,076 1,077 1,125 1,034 1,059 1,052 1,070 1,079 1,080 Nurses ($) 1,091 1,140 1,071 1,021 1,100 1,109 1,075 1,079 Is it reasonable to conclude that the mean weekly salary of nurses is higher? Use the 0.01 significance level. Hint: For the calculations, assume the nurses as the first sample. State the decision rule. (Negative values should be indicated by a minus sign. Round your answers to 3 decimal places.) Compute the value of the test statistic. (Round your answer to 3 decimal places.)
- The Tampa Bay (Florida) Area Chamber of Commerce wanted to know whether the mean weekly salary of nurses was larger than that of school teachers. To investigate, they collected the following information on the amounts earned last week by a sample of school teachers and nurses. School Teachers ($) 1,095 1,076 1,077 1,125 1,034 1,059 1,052 1,070 1,079 1,080 Nurses ($) 1,091 1,140 1,071 1,021 1,100 1,109 1,075 1,079 Is it reasonable to conclude that the mean weekly salary of nurses is higher? Use the 0.01 significance level. Hint: For the calculations, assume the nurses as the first sample.CONSTRUCT A FREGUENCY DISTRIBUTION TABLE WITH A GIVEN DATA BELOW:Which of the following research situations would be most likely to use an independent-measures design? examine the development of vocabulary as a group of children mature from age 2 to age 3 examine the long-term effectiveness of a stop-smoking treatment by interviewing individuals 2 months and 6 months after the treatment ends compare the mathematics skills for 9th-grade boys relative to 9th-grade girls compare the blood-pressure readings before medication and after medication for a group of patients with high blood pressure
- Which of the following research situations would be most likely to use an independent-measures design? a. examine the development of vocabulary as a group of children mature from age 2 to age 3 b. examine the long-term effectiveness of a stop-smoking treatment by interviewing individuals 2 months and 6 months after the treatment ends c. compare the mathematics skills for 9th-grade boys relative to 9th-grade girls d. compare the blood-pressure readings before medication and after medication for a group of patients with high blood pressureGroup 1. Mean= 24.08 Group 2. Mean= 26.5 STD Dev= 4.42 STD Dev= 5.2 Sample Size=16 Sample Size=16 tcritical, .05 2-tailed =Order the following epidemiologic study designs (from 1 being the best, to 8 being the worst) in terms of their effectiveness in supporting causal inference. a) case report or cass series b) cross sectional study c) ecological study d) case-control study e) prospective cohort study f) retrospective cohort study g) randomized, double-blind experimental study h) community experimental study