Reference no: EM13957538
1. A taxicab company manager believes that the monthly repair costs (y) of cabs are related to age (x) of the cabs. Eight cabs are selected randomly and from their records we obtained the following data:
ï" x =134, ï" y = 410, ï" x2 =3 020, ï"y2=24000, and ï" xy =8340.
Estimate the linear regression line.
2. Using the data given in the taxicab company problem (the above problem) compute R2, interpret its meaning.
3. You are interested in comparing four methods of teaching. You randomly assign 20 students to each of the four methods and then administer a standardized test at the end of the study.
What null hypotheses are you interested in testing?
What statistical procedure might you use to test the hypothesis?
4. Suppose you are interested in determining the average number of years that employees of a company stay with the company. If past information shows a standard deviation of 7 months, what size sample should be taken so that at 95% confidence the sampling error will be 2 months or less?
5. We are interested in determining whether or not the variances of the sales at two small grocery stores are equal. A sample of 16 days of sales at each store indicated the following:
Store A Store B
n1 = 16 n2 = 16
Mean 1 = 300 Mean 2 = 310
S1 = $12 S2 = $10
Are the variances of the populations (from which these samples came) equal? Use ? =0.05
|
Write a two to three page summary of your research
: Using standard terminology (see case study #1), write a two to three page summary of your research. At a minimum, your summary must include the following.
|
|
Simple regression calculation page
: Run a regression using your original set of data as your dependent variable, and your time series as an independent variable. Use the simple regression calculation page to calculate your regression. Write a paper reporting your results and any con..
|
|
How do you find the total power radiated
: At a distance of 3.8 m from a siren, the sound intensity is 3.6 x 10^-2 W/m^2. Assuming that the siren radiates sound uniformly in all directions, how do you find the total power radiated?
|
|
Compute economic order quantity-number of orders per year
: Component SM-782 has an annual demand of 3500. The ordering cost is $200 per order, and lead time is 7 days. Inventory holding cost is $140 per unit per year. How much money are they losing every year as a result of this policy? compute economic orde..
|
|
Estimate the linear regression line
: Estimate the linear regression line. Using the data given in the taxicab company problem (the above problem) compute R2, interpret its meaning.
|
|
Following cash disbursements and receipts
: Analyze the following scenario: Duncombe Village Golf Course is considering the purchase of new equipment that will cost $1,200,000 if purchased today and will generate the following cash disbursements and receipts. Should Duncombe pursue the inv..
|
|
Determine the old truck battery voltage
: Not wanting to blow out the battery in the old truck from an over current, there is placed a resistor of 12 Ohms in series with the circuit from the 3 batteries. Judging from the heat of the resistor this person believes that 12 watts of heat is b..
|
|
Role in the protection of the environment
: Analyze the government's role in the protection of the environment. How has the regulation of conservation, evironmentalism, global warming or energy issues resulted in better protection? Who are the major stakeholders in this process?
|
|
Advantages and disadvantages of microbes
: What are the advantages and disadvantages of microbes, vis-a-vis destructive hardware such as guns and bombs? What would be the characteristic of an ideal weapons bug?
|