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A study was conducted to determine the mean number of weekly hours that adults in the US use computers at home. A random sample of 81 adults gives a mean weekly computer usage time of 8.5 hours. Based on prior studies, the population standard deviation is assumed to be 3.6 hours.
Which will provide the narrowest confidence interval? And Why?
a) using 2 samples of 200 each
b) using a sample size of 400
c) using a different sample of size 81
d) using a sample of size 36
If writing scores for population have standard deviation of σ = 20, does sample give adequate evidence to conclude that new composition course has significant effect?
a water treatment plant needs to maintain the ph of the water in the reservoir at a certain level. to monitor this they
Assume that you plan to use a significance level of = 0.05 to test the claim that P1 = P2. Use the given sample sizes and numbers of successes to find the z test statistic for the hypothesis test.
let x have normal distribution with mean 11.3 and standard deviation 5.7.find the cumulative probability of 9.31 or
Two samples of sizes n1 = 20 and n2 = 15 taken from two independent normal populations with known standard deviations, σ1 = 3.5 and σ2 = 4.2, produced sample averages, x¯1 = 15.5 and x¯2 = 13.8.
The population is 500 pounds. At a 80% level, how many elephants need to be weighed so the average weight will be accurate to within 350 pounds?
Exercise 11 The accompanying table gives sample means and standard deviations, each based on n = 6 observations of the refractive index of fiber-optic cable. Construct a control chart, and comment on its appearance
question 1 kelson sporting equipment inc. makes two different types of baseball gloves a regular model and a catchers
the distribution of the amount of money in savings accounts for florida residents has an average of 2200 dollars and a
What is the hourly rate for cars entering the tunnel? Given rate is per minute therefore to get the hourly rate we need to x 60. Hourly rate -= 0.5 x 60 = 30 cars/hour.
Suppose a simple random sample of 20 non-English student have an average math score on the SAT exam of 528. What are the appropriate hypotheses?
What are the null and alternative hypotheses for this test? Use ANOVA and the 0.05 level of significance in testing the null hypothesis identified in part (a).
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