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Listed below are speeds (mi/h) measured from southbound traffic on I-280 near Cupertino, California (based on data from SigAlert). This simple random sample was obtained at 3:30 p.m. on a weekday. Use a .05 significance levelto test the claim that the sample is from a population with a mean that is less than the speed limit of 65 MPH.
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ICR questioned 1000 American male and female heads of household regarding their house cleaning attitudes. The survey has a margin of error of plus or minus 5%.
Calculate the lower limit of a 95 percent confidence interval for the population mean audit delay for all public manager-controlled companies in New Zealand.
Sun Microsystems has approximately 50% of the high-end Unix machines market with its closest competitor being IBM. Suppose that 15 firms were in the market to purchase a high-end Unix machine. Assume that these firms listened to sales pitches by a..
Two independent samples of sizes 16 and 26 were taken. In a test of equality of population means of the two samples, how many degrees of freedom are associated with the critical t-value?
a researcher wishes to compare the effect of the rate of stepping on heart rate in a step-aerobics workout. a
For the following investigative scenarios, state the null hypothesis, and the alternative hypothesis. Also identify the Type 1 and Type 2 errors which can result based on the hypotheses that you defined.
In a study of human blood types in nonhuman primates, a sample of 71 orangutans were tested and 14 were found to be blood type B. Construct a 95% confidence interval for the population proportion of blood type B in the orangutan population.
farnum 1994 discusses a chrome plating process. small electric currents are run through a chemical plate that contains
A recent national survey found that high school students watched an average (mean) of 6.8 videos per month. A random sample of 36 college students revealed that the mean number of videos watched last month was 6.2
question two builders a and b are competing for a contract to construct a new office block. each can bid either
What is the probability that a sample mean will be within plus-or-minus two of the population mean for each of the following sample sizes?
If the Consumer Price Index in June 2006 was 159.3 (1982-84=100), what does this indicate about prices from 1982-84 to June 2006?
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