1. Questions

Statistic

Researchers collected samples of water from streams in a mountain range to investigate the effects of acid rain. They measured the pH (acidity) of the water (a lower pH means the water is more acidic). They then classified the steams with respect to the kind of substrate (type of rock on which they flow). Here are the results:

Substrate Size Mean StandardDeviation Limestone 41 7.7 2.2
Shale 33 6.8 1.7

-Is there sufficient evidence that there is a significant difference in the acidity of streams that flow on limestone and on shale?

a. What is (are) the parameter(s) we are conducting inference on? Choose one of the following symbols (mean; meanDifferent (the mean difference from a matched pairs design); mean1 - mean2 (the mean difference from independent samples); p, or p1 – p2) and describe it in words.

b. Are the conditions satisfied? Why or why not?
If the answer to part b is no, do not complete the rest of #2.

c. At the 0.05 significance level, can the researcher conclude from these data that there is a significant difference between the mean acidity of the streams that flow on limestone and on shale?
i.State the null and alternative hypotheses.
ii.State the significance level for this problem.
iii.Calculate the test statistic.
iv.Calculate the P-value and include the probability notation statement.
v.State whether you reject or do not reject the null hypothesis.
vi.State your conclusion in context of the problem (i.e. interpret your results).

  1. 👍
  2. 👎
  3. 👁
Johny

  1. We do not do your homework for you. Although it might take more effort to do the work on your own, you will profit more from your effort. We will be happy to evaluate your work though.

    1. 👍
    2. 👎
    PsyDAG

Respond to this Question

First Name

Your Response

Similar Questions

  1. Science

    1. How does groundwater cause erosion and deposition? a. When acidic water soaks into the ground, water dissolves limestone, resulting in the formation of caves. *** b. When a river overflows, it moves downhill, resulting in the

  2. Help me with science

    Use the table to answer the question. Sample Observation 1 The drop of food coloring spreads slowly. 2 The drop of food coloring spreads very quickly. A student places a drop of food coloring into two water samples. Her

  3. Chemistry

    hydrogen gas collected by water displacement. what is the pressure with the H2 collected if temp 24degree C

  4. Honors Pre-Calculus

    You are traveling in a car toward a certain mountain at a speed of 80km/hr. The apparent size of the mountain is .5degrees. Fifteen minutes later the same mountain has an apparent size of 1 degree. About how tall is the mountain?

  1. Chemistry

    In a certain mountain range, water boils at 92°C. What is the atmospheric pressure under these conditions? The enthalpy of vaporization of water at 100°C is 40.7 kJ/mol. R=8.31J/(K*mol))

  2. Math

    A wildlife biologist in Nova Scotia is testing the pH of stream water. She hopes that the pH of the water is greater than 5.5 so that Atlantic Salmon returning this year to their natal streams will be able to reproduce. The

  3. spanish

    What mountain range overlooks Santiago chillie

  4. Math

    A function is created to represent the height above sea level of a mountain climber every hour. What restrictions would be made to the range? A-range includes all real numbers B-range includes positive integers C-range includes

  1. earth

    Sometimes streams and rivers run in fairly straight lines. Sometimes, they meander or curve and wander. What is your idea about how faster water affects the shape of a stream or river? A) Faster streams are straighter. B) Faster

  2. Chemistry

    An 89.3 mL sample of "wet" O2 (g) is collected over water at 21.3oC and a barometric pressure of 756 mm Hg(vapor pressure of water at 21.3oC = 19 mm Hg). What is the partial pressure of O2 (g) in the sample collected, in mm Hg?

  3. Chemistry

    In which case is heat involved: mixing 100.0-g samples of 90'C water and 80'C water or mixing 100.0-g samples of 60'C water? assume no heat is lost to the environment. please help thanks.

  4. Chemistry

    You are in a mountain range with atmospheric air pressure of 520 , and you wish to boil some eggs. What is the approximate boiling point of the water at this air pressure? Express your answer as an integer and include the

You can view more similar questions or ask a new question.