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Question: Physical Sciences It is important to maintain a low ammonia-ion concentration in freshwater aquariums to ensure healthy fish (and plants). An ammonia neutralizer is advertised to almost instantly detoxify ammonia (i.e., reduce the concentration of ammonia ions) in order to protect fish. Fourteen untreated 20-gallon aquariums were selected at random, and the ammonia-ion concentration (in ppm) in each was measured. One hour after the directed amount of the neutralizer was used, the ammonia ion concentration was measured again. Assuming normality, is there any evidence to suggest that the neutralizer decreases the mean ammonia-ion concentration? Use a = 0.025.
the no. of grams of carbohydrates contained in 1-ounce servings of randomly selected chocolate and non chocolate candy
A sample of 500 respondents in a large metropolitan area was selected to study consumer behavior. Among the questions asked was "do you enjoy shopping for clothing?" Of 240 males, 136 answered yes.
What is the appropriate procedure to test for a significant in different means between the 2 age groups. What is the p-value corresponding to your this answer and compute a 95% CI for the difference in means between the two groups.
Use MINITAB or some other computer software to construct a histogram of the drying-time data in Exercise 115. The following are the drying times (minutes) of 100 sheets coated with polyurethane under various ambient conditions:
Construct a 95% confidence interval estimate of the difference in kilometers per liter. Do the results of parts (a) and (b) agree? Explain why or why not.
Please discuss an application of ANOVA that might be undertaken in a workplace. What are the 3 or more treatments? What is the response variable?
question 1.when drawing a rectangle or creating a rectangular object a particular ratio of width to length is thought
For a continuous random variable, is the probability density function, f(x), or the cumulative distribution function, F(x), more useful in calculating probabilities? Explain why you reach this conclusion.
Assume the cholesterol levels of adult American women are normally distributed with a mean of 190 mg/dL and a standard deviation of 26 mg/dL. What percent of adult women do you expect to have cholesterol levels at least 200 mg/dL?
it is estimated that 0.5 of the callers to the customer service department of dell inc. will receive a busy signal.
a random sample of 500 connecting rod pins contains 65 nonconforming units. estimate the process fraction
In a known population of children, aggression is normally distributed with a µ=25, and s=12.
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