A Company produces candy on a production line. When operating properly, the production process will produce an average of u=140 pounds of candy per hour with a standard deviation of o=20 pounds of candy per hour. It is also known that the distribution is skewed left. In order to monitor the assembly process, 100 hours are ran
Here are some things I need help with: ? ALWAYS write out the NULL & HYPO (they come as a set) even if the assignment does not ask you to do so ? Even though you write hypotheses using mathematical notations, it is important to also get in the habit of writing them in words too... things do get more complicated ? Alwa
A program to decrease littering was carried out in four cities in California's Central Valley starting in August 2000. The amount of litter in the streets (average pounds of litter collected per block per day) was measured during the July before the program was started and then the next July, after the program had been in effect
4. Car dealership chain owner wants to increase the car sales of his chain. He wants to determine which factors influence the sales performance. Owner thinks that the following factors have a significant impact on sales performance: X1 = number of years of experience as a car sales person X2 = age Sales performance is me
Please help with the following two statistics problems. Thanks! (Complete problems also found in attachment) ------ 1. Two Internet Service Providers (ISP) in Greensboro, NC area compete for customers. In order to select the better provider, we want to test whether there is a difference in the proportion of times a
1. The sales of Crusty The Clown cereal since 2000 are: Year Code Sales ($ millions) 2000 1 5 2001 2 7 2002 3 6 2003 4 10 2004 5 12 What is the sales forecast for 2005? 2. The owner of a car dealership wants to determine whether there is a relation between the income level and the ty
Employer A states the average number of days missed by each staff member is 4.0. Office personnel randomly sampled a portion of their attendance records to determine if this claim was accurate. For the previous year, the following data was obtained from the sample group, regarding absences for that year: 4, 4, 3, 2, 6, 8, 7, 1
I am a manufacturer of refrigerators. Historically ( the last year of manufacturing) I averaged 200 units a week with a 10 unit standard deviation. Recently we upgraded some of the line to improve production. I took a random sample over 30 random weeks and came up with a sample average of 205 units Did I make improvements
3-10. A researcher interested in the senses of taste and smell has carried out extensive studies in which university students are given each of 20 different foods (apricot, chocolate, cherry coffee, garlic, and so on). She administers each food by dropping a liquid on the tongue. Over the entire student population at her univers
1. The chief of security for the Mall of the Dakotas was directed to study the problem of missing goods. He selected a sample of 100 boxes that had been tampered with and ascertained that for 60 of the boxes, the missing pants, shoes, and so on were attributed to shoplifting. For 30 other boxes employees had stolen the goods, a
Listed below is the rate of return for one year (reported in percent) for a sample of 12 mutual funds that are classified as taxable money market funds. 4.63 4.15 4.76 4.70 4.65 4.52 4.70 5.06 4.42 4.51 4.24 4.52 Using the .05 significance level is it reasonable to conclude that the mean rate of return is more than 4.50 percen
The Department of Management Science at Tech has sampled 250 of its majors and compiled the following frequency distribution of grade point averages (on a 4.0 scale) for the previous semester. GPA Frequency 0-0.5 1 0.5-1.0 4 1.0-1.5 20 1.5-2.0 35 2.0-2.5 67 2.5-3.0 58 3.0-3.5 47 3.5-4.0 18 250 The sample
The owner of Maumee Ford-Mercury wants to study the relationship between the age of a car and its selling price. Listed below is a random sample of 12 used cars sold at the dealership during the last year. Car Age (years) Selling Price ($0.00) 1 9 8.1
For each of the following problems, be sure to specify the null hypothesis being tested, and whether you will use a t test for independent samples or a t test for nonindependent samples; also, specify whether you will use a one-tailed or two-tailed test. 1. In a study designed to discover whether men or women drink more coffe
a) What is the difference between a normal distribution and a standard normal distribution? b) What is the purpose of using a standard normal distribution instead of the normal distribution? c) Please cite one example of how the standard normal distribution is used, including the Z-values for your example. d) If you
Tourism is one consideration for CoffeeTime's future, A survey of 1,233 visitors to mumbai last year revealed that 110 visited a small cafe during their visit. Laura claims that 10% of tourists will include a visit to a cafe.
1. A financial analyst wants to compare the turnover rates, in percent, for shares of oil-related stocks versus other stocks, such as GE and IBM. She selected 32 oil-related stocks and 49 other stocks. The mean turnover rate of oil-related stocks is 31.4 percent and the standard deviation 5.1 percent. For the other stocks, the m
1. The following is a hypothetical set of anxiety scale scores from a population of students being seen at a college counseling center: 5 16 47 6 18 50 9 25 50 10 46 50 12 47 78 What are the Z and the T scores of the person who scored 6? 18? Of the two people who scored 47? Of the person who scored 78? Why is it not a
Fairfield Homes is developing two parcels near Pigeon Fork, Tennessee. In order to test different advertising approaches, they use different media to reach potential buyers. The mean annual family income for 75 people making inquires at the first development is $150,000, with a standard deviation of $40,000. A corresponding samp
Ms. Lisa Monnin is the budget director the New process Company. She would like to compare the daily travel expenses for the sales staff and the audit staff. She collected the following sample Sales $ 131 135 146 165 136 142 Audit 130 102 129 143 149 120 139 At the .10 significance level, can she conclude that the mean da
The management of Discount Furniture, a chain of discount furniture stores in the Northeast dwsigned an incentive plan for sales people. To evaluate this innovative plan, 12 salespeople were selected at random and their weekly incomes before and after the plan were recorded. Salesperson Before After Malone $320 $340 Quic
Clark Heter is an industrial engineer at Lyons Products. He would like to determine whether there are more units produced on the afternoon shift than on the day shift. A sample of 54 day-shift workers showed that the mean number of units produced was 345, with a standard deviation of 21. A sample of 60 afternoon-shift workers sh
2) In 1999 the Center of Disease Control estimated that about 34.8% of high-school students smoked cigarettes. They established a national health goal of reducing that figure to 16% by the year 2010. To that end, they hoped to achieve a reduction to 30% by the end of 2001. Early in 2002 they released a research study in which on
I am doing a project where I am comparing the accuracy and reproducibility of 3 different force gauges with varied angles and applied pressures. All of the gauges have a 50 lb. capacity. They will all be tested with 0-30 lbs in 5 lb increments of applied load/pressure. They will also be tested at 0 degrees (true perpendicular)
Let X... We observe X=9 out of n=15. Is the battery more likely to last more than 5 years? Please see the attached file for the fully formatted problems.
For a number of years... In the first year after the change, there were 56- survivors in a class of 800. Is this increase explainable as simply sampling variability? Test at a=0.01. Please see attached.
Let X...Is the battery likely to last more than 5 years? Please see attached.
Seven skulls... Use these statistics in a test of the hypothesis that these skulls belong to a race previously found nearby in which the average width if known to be 146mm. Assume a nearly normal population. Perform the test a=0.1. Please see attached.
2. Test statistic components are... Please see the attached file for the fully formatted problems.
Perform each of the steps below using Excel. Use the collected data from the chart (MLB Statistics) as a sample of the population (Any one statistic you choose). Describe the population that the data represents. Interpret each of your results with a conclusion and decision. Use any statistic on the MLB chart to answer the questi