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3. Most water treatment facilities monitor the quality of their drinking water on an hourly basis. One variable monitored is pH, which measures the degree of alkalinity or acidity in the water. A target pH level is 8.5. pH values below 8.5 is acidic and above 8.5 is alkaline, both of which are bad for health. A random sample of 20 measurements resulted in an average pH of 8.55 with a standard deviation of 0.28 (10 pts) a. Does the sample provide sufficient evidence that the mean pH level in the water differs from 8.5? Conduct a test at the ? = .01 level b. What are the upper and lower limits of the 95% confidence intervals
If the population mean is estimated within two days, how many salespeople should be sampled?
Find a 95% confidence interval for the mean monthly rent for unfurnished one-bedroom apartments available for rent in this community.
The mean of major student taking the GRE test in 2010 was 1000 with a standard deviation of 230. if you select a random sample of 75 students, what is the probabbility that the mean score is below 950?
How many seats sould be in the non-smoking area in order to be very sure (mean+3StandardDeviation) of having enough seating there?
What is wrong with this design? What confounds could be leading to the results of improved memory and problem-solving skills?
The products are acceptable and that 30% are defective. If five of the products are randomly selected, find the probability that all five are defective?
is it appropriate to compute a CI estimate of proportion when the condition to use the normal approximation is 6.8345? What is the 92% CI estimate of proportion?
If 45% of the residents play poker and garden and 50% of the residents play both shuffleboard and poker, find the probability that a resident plays poker, given that they garden (that is, find P(poker | garden)
131 are enrolled in both economics and mathematics course. Determine the probability that freshman selected at random from group is enrolled in each of the following?
In order to control costs, a company wishes to study the amount of money its sales force spends entertaining clients. Compute and interpret the Z score for each of the six entertainment expenses.
At the 1% significance level, can it be concluded that the current distribution of responses differs from that of a year ago ?? Formulate and test the appropriate hypotheses. Use the critical value approach.
Using the Hypothesis Tests Two Sample file and a .05 significance level, test whether there is a difference in the mean salary for men versus women.
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