Question: A traditional method of verifying mineralization grades in mining is to drill twinned holes. i.e., the drilling of a new hole, or twin, next to

A traditional method of verifying mineralization grades in mining is to drill twinned holes. i.e., the drilling of a new hole, or "twin," next to an earlier drill hole. The use of twinned drill holes was investigated in Exploration and Mining Geology (Vol. 18, 2009). Geologists use data collected at both holes to estimate the total amount of heavy minerals (THM) present at the drilling site. The data in the table on the next page (based on information provided in the journal article) represent THM percentages for a sample of 15 twinned holes drilled at a diamond mine in Africa. The geologists want to know if there is any evidence of a difference in the true THM means of all original holes and their twin holes drilled at the mine.
a. Explain why the data should be analyzed as paired differences.
b. Compute the difference between the "1st Hole" and "2nd Hole" measurements for each drilling location.
c. Find the mean and standard deviation of the differences, part b.
d. Use the summary statistics, part c, to find a 90% confidence interval for the true mean difference ("1st Hole" minus "2nd Hole") in THM measurements.
e. Interpret the interval, part d. Can the geologists conclude that there is no evidence of a difference in the true THM means of all original holes and their twin holes drilled at the mine?

Ho 72063040010140 d-5 11 6 5 9 7 8 9 6 8 0807 509209140236550 515807 10 7 7 9 88050 -. 2 3 4 5 6 7 8 9 0 2 3 4 5 1

Step by Step Solution

★★★★★

3.51 Rating (171 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

a Since the data were collected as twin holes it needs to be analyzed as paired differ... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Document Format (1 attachment)

766-M-S-H-T (4925).docx

120 KBs Word File

Students Have Also Explored These Related Statistics Questions!

Alexander Wilson operates Metroplex Courier and Delivery Service. He has four employees who are paid on an hourly basis. During the workweek beginning December 15 and ending December 21, 2019, his...

A vice president for marketing recruits 20 college graduates for management training. Each of the 20 individuals is randomly assigned, 10 each, to one of two groups. A "traditional" method of...

A vice president for marketing recruits 20 college graduates for management training. Each of the 20 individuals is randomly assigned, to one of two groups (10 in each group). A "traditional" method...

Which of the following is an example of a paired design? A. A teacher compares the pretest and posttest scores of a group of students. B. A teacher compares the scores of students using a computer...

%) 8.3.33-T EQuestion Help A traditional method of verifying mineralization grades in mining is to drill twinned holes, i.e., the drilling of a new hole, or "twin," next to an earlier drillhole....

Twinned drill holes. A traditional method of verifying mineralization grades in mining is to drill twinned holes, i.e., the drilling of a new hole, or twin, next to an earlier drillhole. The use of...

Twinned drill holes. Refer to the Exploration and Mining Geology (Vol. 18, 2009) study of drill twinned holes, Exercise 8.33 (p. 462). Recall that the drilling of a new hole, or twin, next to an...

Refer to the Exploration and Mining Geology (Vol. 18, 2009) study of drilling twin holes, Exercise 7.49. Recall that geologists use data collected at both holes to estimate the total amount of heavy...

Let p denote the proportion of grocery store customers who use the stores club card. For a largesample z test of H0: p = .5 versus Ha: p = .5, find the P-value associated with each of the given...

Let (R*,) be the multiplicative group of nonzero real numbers. Show that H = {a+b5 a,b Q,a+b5 + 0} is a subgroup of R* (Helpful along the way: you can use that 5 is not rational, so if a +b5=0 with...

Find a particular integral for the second - order ODE dx 2 d 2 y 5 dxdy + 6 y = 0

Smith Auto purchased a neighboring lot for a new building and parking lot. Indicate whether each of the following expenditures is properly charged to; (a) Land (b) Land Improvement, or (c) Building...

Indicate whether each of the following actions is primarily related to (a) Acquisition of long-term assets, (b) Evaluating the adequacy of financing of long-term assets, (c) Applying the matching...

Trek Company has the following production data for April: units transferred out 40,000, and ending work in process 5,000 units that are 100% complete for materials and 40% complete for conversion...

Hogan Whitner owns a machine shop and has the opportunity to purchase a new machine for $30,000. After carefully studying projected costs and revenues, Whitner estimates that the new machine will...

Income statement data for Winthrop Company for two recent years ended December 31 are as follows: A. Prepare a comparative income statement with horizontal analysis, indicating the increase...

In the U.S. the North and South are quite different. Below is the joint probability distribution of political affiliation (R Republican, I Independent and D Democrat) for a Northern city and a...

Fresh fruit price and quantity data for the years 1988 and 2007 follow (Census Bureau website, March 19, 2009). Quantity data reflect per capita consumption in pounds and prices are per pound. a....

Starting faculty salaries (nine-month basis) for assistant professors of business administration at a major Midwestern university follow. Use the CPI to deflate the salary data to constant dollars....

The five-year historical prices per share for a particular stock and the Consumer Price Index with a 1982-1984 base period follow. Deflate the stock price series and comment on the investment aspects...

You've invested $2,800 in Stock Arbuckle and $3,800 invested in Stock Roscoe. The expected returns on these stocks are 8 percent and 11 percent, respectively. Calculate the expected return on the...

The balance sheet and income statement shown below are for Sneaker Inc. Note that the firm has no amortization charges, it does not lease any assets, none of its debt must be retired during the next...

Present value ( in $ ) of an annity due \ table [ [ \ table [ [ Annuity ] , [ Payment ] ] , \ table [ [ Payment ] , [ Frequency ] ] , \ table [ [ Time ] , [ Period ( years ) ] ] , \ table [ [ Nominal...