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One-sided versus two-sided P-values.
Computer software reports x‾ = 15.3 and P = 0.074 for a t test of H0: μ = 0 versus Ha: μ ≠ 0. Based on prior knowledge, you can justify testing the alternative Ha: μ > 0. What is the P-value for your significance test?
The advertising firm of McMann and Tate has put out bids for two separate contracts. Based on past experience, they believe that they have a 0.7
Their mean monthly sales were $10,000 with a standard deviation of $1000. Construct a 95% confidence interval for the population mean.
In a sample of 55 mice, a biologist found that 42% were able to run a maze in 30 second or less. Find the 90% limit for the population proportion of mice who can run a maze in 30 second or less.
a spymaster has a network of 7 operatives whom he pays out of a slush fund containing 20000. for accounting reasons his
Do the data indicate that the distribution of preferences for older adults is significantly different from the distribution for college students? Test with .05.
Assume gasoline prices for a region are normally distributed. Do the data you obtained provide enough evidence to reject the claim?
In each of the given situations, indicate whether the potential bias is a selection bias, a nonparticipation bias, or a response bias.
Of the 500 surveyed, 350 said they would vote for the Democratic incumbent. Using the 0.99 confidence coefficient, what are the confidence limits for the proportion that plan to vote for the Democratic incumbent?
Estimate the probability the store will gross over $850 a) Fewer than 5 out of 10 business days.
What about drawing a random sample only from cell phone exchanges? Discuss the advantages and disadvantages of such a sampling method compared with surveying randomly generated telephone numbers from non - cell phone exchanges.
What differentiates a z test statistic for a population from the z statistic for a sampling of means? Why is there a difference? Consider a normal population with ? = 43 and ? = 5.2. Calculate the z-score for an x ? of 46.5 from a sample of size 16.
Using the electronic resources, compile the required data for the 75 countries in an Excel spreadsheet (each row should represent a country and each column should contain the data for one variable). Read the compiled data into Stata, and construct ..
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