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Q1) Market research firm wishes to conduct survey to evaluate average amount spent by visitors to within $20. History tells us population standard deviation is $398.
a) How large does my random sample size (n) require to be at 95% confidence interval?
b) How large does my random sample size (n) require to at 98% confidence interval?
Q2) A researcher claims average Hotel Rate in San Diego CA is $156/night in the month of November 2009. You think this is low, and wish to prove average rate is higher, so you arbitrarily gather sample of 25 data points from different hotels on random dates in that month. You determine the average rate of 168 with standard deviation of 30. By using significance level a = .05, and suppose a normal distribution what does evidence conclude?
The average hourly wage of employees of a certain company is $9.83. Assume the variable is normally distributed.
Salary information for a random sample of male and female employees of a large company is shown below.
How much net profit can John expect (on average) to earn from the store in total over the next five years?
A random sample of students is selected, and each one is asked to try first brand A and then brand B, or vice versa with the order determined at random.
Answer the following three questions based on what you know about statistics now.
A company makes molded plastic toys. They study the plastic injection process into the molds. A common cause of variation and What are the control limits for an chart
Describe the sampling distribution of the sample proportion
Identify the independent and dependent variables, and Construct a nominal, ordinal, and interval level measure for each independent and dependent variable.
ABC Corporation has been using statistical process control for several months.
The chi-square goodness of fit test can be used when we:
Compute the value of the test statistic (to 2 decimals).
Using ANOVA, determine if there is a significant difference in the six year graduation rate by type.
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