A certain chemical pollutant in the Arkansas River has been constant for several years with mean μ = 34 ppm (parts per million). A group of factory representatives whose companies discharge liquids into the river is now claiming they have lowered the average with improved filtration devices. A group of environmentalists will test to see if this is true. Find the rejection region appropriate for this test if we are using a significance level of 0.05 and have a sample size of 25.

A) Reject H0 if t < -1.960

B) Reject H0 if t < -2.064

C) Reject H0 if t < -1.711

D) Reject H0 if t < -1.708

E) Reject H0 if t < -2.064 or t > 2.064

C) Reject if t < -1.711

Step-by-step explanation:

We are given that a certain chemical pollutant in the Arkansas River has been constant for several years with mean μ = 34 ppm (parts per million).

Also, it is given that the level of significance is 0.05 and a sample size of 25 is taken.

Let =  average chemical pollutant in the Arkansas River

So, Null Hypothesis, : = 24 ppm     {means that the average is same as before with improved filtration devices}

Alternate Hypothesis, : < 24 ppm      {means that they have lowered the average with improved filtration devices}

Now, t test statistics is given by; T.S.  =    ~

where, n = sample size = 25

n - 1 = degree of freedom = 25 - 1 = 24

Now, at 0.05 significance level in the t table, the critical value at 24 degree of freedom is given as - 1.711 for left tailed test.

So, we will reject our null hypothesis when the t test statistics is less than the critical value of t which means reject null hypothesis if t < -1.711.

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do your homework.

use mnemonics and other tricks.

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note: the best i know.

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles