Question: 97. The article Pine Needles as Sensors ofAtmospheric Pollution (Environ. Monitoring, 1982: 273286) reported on the use of neutron-activity analysis to determine pollutant concentration in

97. The article Pine Needles as Sensors ofAtmospheric Pollution (Environ. Monitoring, 1982: 273—286)

reported on the use of neutron-activity analysis to determine pollutant concentration in pine needles.

According to the article s authors, These observations strongly indicated that for those elements which are determined well by the analytical procedures, the distribution of concentration is lognormal.

Accordingly, in tests of signi cance the logarithms of concentrations will be used. The given data refers to bromine concentration in needles taken from a site near an oil- red steam plant and from a relatively clean site. The summary values are means and standard deviations of the log-transformed observations.

SD Sample Mean Log of Log Site Size Concentration Concentration Steam 8 18.0 4.9 plant Clean 9 11.0 4.6 Let be the true average log concentration at the rst site, and de ne analogously for the second site.

a. Use the pooled t test (based on assuming normality and equal standard deviations) to decide at signi cance level .05 whether the two concentration distribution means are equal.

b. If and , the standard deviations of the two log concentration distributions, are not equal, would m1 and m2, the means of the concentration distributions, be the same if ? Explain your reasoning.

Step by Step Solution

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock blur-text-image

Question Has Been Solved by an Expert!

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

Step: 2 Unlock

Step: 3 Unlock

Students Have Also Explored These Related Modern Mathematical Statistics With Applications Questions!

The article Pine Needles as Sensors of Atmospheric Pollution (Environ. Monitoring, 1982: 273286) reported on the use of neutron-activity analysis to determine pollutant concentration in pine needles....

The article "Pine Needles as Sensors of Atmospheric Pollution" (Environ. Monitoring, 1982: 273-286) reported on the use of neutron-activity analysis to determine pollutant concentration in pine...

=+82. The article Pine Needles as Sensors of Atmospheric Pollution (Environ. Monitoring, 1982: 273286) reported on the use of neutron-activity analysis to determine pollutant concentration in pine...

Where am i doing wrong? Pine Needles Company acquired 80% ownership of Straw Corporation on January 1, 2018, for $36,000 and used the equity method to account for its investment. On the acquisition...

BAB 2 3 1 NEGOTIATION EXERCISE Instructions for Ontario Place The music group The Pine Needles has a hit album that is very popular with teens and pre - teens. They are planning a summer cross -...

(A @ D] e Use precise words instead of vague ones. e Express your ideas in as few words as possible. e When writing a response, use formal language instead of slang. HiSET EXAM TIP When you read your...

KEY IDEAS Revise your response so that the organization is clear to the reader. e Make sure that paragraph breaks fall in the right places. e Check for faulty transitions and irrelevant details....

7.21 The Aleppo pine and the Torrey pine are widely planted as ornamental trees in southern California. Here are the lengths (centimeters) of 15 Aleppo pine needles: 10.2 7.2 7.6 9.3 12.1 10.9 9.4...

Beta and required rate of return A stock has a required return of 11 percent; the risk-free rate is 7 percent; and the market risk premium is 4 percent. a. What is the stocks beta? b. If the market...

Osmosis occurs when two solutions of different concentrations are separated by a semipermeable membrane. The membrane allows solvent particles, but not solute particles, to pass through. Thus, the...

5 a Use the following information to produce a food web. A frog feeds on butterfly caterpillars. A butterfly caterpillar feeds on plants. A snake eats frogs. A grasshopper feeds on plants. A...

What is the definition of cooperative strategy, and why is this strategy important to firms competing in the current competitive landscape?

86. The article Evaluating the BOD POD for Assessing Body Fat in Collegiate Football Players (Medicine and Science in Sports and Exericse, 1999: 13501356) reports on a new air displacement device for...

a. Use various methods to decide whether it is plausible that the two techniques measure on average the same amount of fat.

b. Use the data to develop a way of predicting an HW measurement from a BOD POD measurement, and investigate the effectiveness of such predictions.

Cathy Company operates a cleaning service. The grid below is a list of possible effects on the Income Statement and the Balance Sheet. The code is: + increase; decrease; NE no effect Revenue Expense...

Using Table 11-1, calculate the compound amount and compound interest (in $) for the investment. (Round your answers to the nearest cent.) Principal $8,000 Time Nominal Interest Period (years) Rate...

1. What are total revenues? 2. What is Net Income? 3. What are total assets? 4. Do liabilities + equity accounts = total assets? If not, by how much are you off? Account Balance Accounts Payable...