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The value of the z-score that is obtained for a hypothesis test is influenced by several factors. Some factors influence the size of the numerator of the z -score and other factors influence the size of the standard error in the denominator. For each of the following, indicate whether the factor influences the numerator or denominator of the z-score and determine whether the effect would be to increase the value of z (father from zero) or decrease the value of z (closer from zero), in each case, assume that all other components of the z-score remain constant.
a- Increase the sample size.
b- Increase the population and standard deviation.
c- Increase the difference between the sample mean and the value of u specified in the null hypothesis.
State the decision rule. Compute the value of the test statistic. What is your decision regarding the null hypothesis?
A product sold by Home Depot, Inc., with an annual demand of 1000 units has Co = $25.50 and Ch = $8. The demand exhibits some variability such that the lead-time demand follows a normal probability distribution
Define the variable - the weight in pounds - it is a dependent variable. Find the mean, median, mode, variance, and standard deviation for your data.
An investor owns three common stocks. Each stock, independent of the others, has equally likely chances of (1) increasing in value, (2) decreasing in value, or (3) remaining the same value.
Forecasting: The sales data for the lone star Sports Apparel Company for the last 12 years are as follows: What is the 2001- 2012 compound growth rate?
A loan application is received this morning. What is the probability that:
Find out a 95% confidence interval for the proportion p of adults who have a great deal of trust and confidence in the executive branch of government.
Four students riding to school together offer a the excuse of a flat tire on their car for missing a test. On the makeup test, the professor asks the students to each identify the tire that went flat.
Is this statistically significant evidence that candidate has sufficient valid signatures overall? Describe.
A random sample obtained from a population has a mean of µ=100 and a standard deviation of σ = 20. The error between the sample mean and the population mean for a sample of n = 16 is 5 points and the error between a sample men and population mean ..
Estimate the 95% confidence interval for the proportion of the electorate that support this policy.
The standard screening test for Down's syndrome is based on a combination of maternal age and the level of serum alpha fetoprotein. Using the test 80% of Down's syndrome cases can be identified while 5% of normals are detected as positives.
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