Suppose that the mean PCB concentration per fish is 11.2 parts per million with a standard...

Suppose that the mean PCB concentration per fish is 11.2 parts per million with a standard deviation of 2 parts per million in a river. Assume the PCB concentration per fish have a normal distribution. A new random sample of 10 fish has been tested. The PCB concentrations are listed in the following. 11.5, 12.2, 11.4, 11.8, 10.8, 10.9, 11.9, 12.0, 12.4, 11.6 Use the 5 percent level of significance, test that the mean PCB concentration in the fish has changed at 11.2 parts per million.

Solutions

Expert Solution

orchestra answered 1 year ago

Next > < Previous

Related Solutions

Suppose that the mean PCB concentration per fish is 11.2 parts per million with a standard...

the flame side of the AA measures concentration in parts per million range and the furnace...

the flame side of the AA measures concentration in parts per million range and the furnace side of the AA measures in parts per billion. what is the major difference in terms of sample introduction and electron excitation for these two kinds of spectroscopy? I am in desperate need of help!!! It would be amazing if someone were to answer this in a way where it makes sense.

The urinary fluoride concentration (parts per million) was measured both for a sample of livestock grazing...

The urinary fluoride concentration (parts per million) was measured both for a sample of livestock grazing in an area previously exposed to fluoride pollution and for a similar sample grazing in an unpolluted region: Polluted. 21.3. 18.7 23.0. 17.1. 16.8. 20.9. 19.7 Unpolluted. 14.2. 18.3. 17.2. 18.4. 20.0 Does the data indicate strongly that true average fluoride concentration for livestock grazing in the polluted region is larger than for the unpolluted region? Use the appropriate test at level α =...

Percent by mass to parts per million. Convert 4.45% NaOH(aq) solution to parts per million NaOH...

Percent by mass to parts per million. Convert 4.45% NaOH(aq) solution to parts per million NaOH in the solution. Do NOT assume a dilute aqueous solution! Use the molar mass of the entire salt formula, not either ion alone. The solution density is 1.047 g/mL. Answer to 3 significant figures with appropriate units.

An unknown distribution has mean 82 and a standard deviation of 11.2. Samples of size n...

An unknown distribution has mean 82 and a standard deviation of 11.2. Samples of size n = 35 are drawn randomly from the population. Find the probability that the mean of the sample means is between 81.2 and 83.6.

The units of parts per million (ppm) and parts per billion (ppb) are commonly used by...

The units of parts per million (ppm) and parts per billion (ppb) are commonly used by environmental chemists. In general, 1 ppm means 1 part of solute for every 106 parts of solution. (Both solute and solution are measured using the same units.) Mathematically, by mass, ppm can be expressed as shown below. ppm = µg solute g solution = mg solute kg solution In the case of very dilute aqueous solutions, a concentration of 1.0 ppm is equal to...

Suppose X is a normal with zero mean and standard deviation of $10 million. a) Find...

Suppose X is a normal with zero mean and standard deviation of $10 million. a) Find the value at risk for X for the risk tolerances h=0.01, 0.02, 0.05, 0.10, 0.50, 0.60, and 0.95. b) Is there a relation between VaR for values of h <= 0.50 and values for h>= 0.50?

Suppose that the mean caloric intake for Americans is 2,500 calories per day, with a standard...

Suppose that the mean caloric intake for Americans is 2,500 calories per day, with a standard devia- tion of 175 calories per day. Assume that caloric intakes for Americans are approximately normally distributed. (a) (3 points) Find the probability that a randomly selected American consumes more than 2,250 calories per day. (b) (3 points) Find the probability that a randomly selected American consumes at most 1,950 calo- ries per day. (c) (3 points) Find the probability that a randomly selected...

Have a standard curve and determine the concentration of the samples. Get the mean, standard deviation...

Have a standard curve and determine the concentration of the samples. Get the mean, standard deviation for the two samples tested in triplicate and run a t.test. Is there a difference between the two samples? These were two different sets of serum (two different pigs). I would think they will be different but let's see. Questions As you should recall, glucose is a reducing sugar. There are many chemical assays for reducing sugars such as using Nelson's alkaline copper reagent...

A particular fish population has a mean length of 230 mm and a standard deviation of...

A particular fish population has a mean length of 230 mm and a standard deviation of 50 mm. What is the probability that a random sample of 16 fish from this population has a mean length of at least 240 mm?

Subjects