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What is the mean of this data set? What is the median of this data set? How many modes does the data set have, and what are their values?
Calculate the reliability as a percentage value. Write your answer to 5 decimal places (e.g. 12.12345).
How long will it take for the populatiom of a certain country to double if its annual growth rate is 7.8%?
Only need Scores on a statistics exam are normally distributed. What is the chance that a randomly-selected person obtains a score that is greater than 113.6?
The weight of chocolate bars from a particular chocolate factory has a mean of 8 ounces. What is the z-score corresponding to a weight of 8.17 ounces?
State appropriate null (Ho) and alternative (H1) hypotheses. What is the critical value if we work with a significant level a = 0.05?
Discuss how many friend samples Sara should have in order to draw the conclusion with 95 percent confidence interval? Why?
Analyze two ways that researchers attempt to control extraneous variables. Support your answer with peer-reviewed articles.
What is a random variable? What are the 4 characteristics of a binomial experiment? Can we use a binomial distribution to model this process?
The distribution of SAT math scores is normal withmean 500 and standard deviation 115. Who did better in terms of standardized z-score?
If the top 10% of students are given an A, what is the lowest mark a student can have and still be awarded an A?
What kinds of results in your personal or professional lives could use the ANOVA test? Why?
Assume that a distribution has a mean of 21 and a standard deviation of 7. What percentage of the values in distribution do we expect to fall between 21 and 35?
A consumer group believes that the proportion of defects among computers produced by one manufacturer. State the null and alternative hypotheses.
The CEO of a company claims that 90% of its employees have very high job satisfaction. Can we conclude that the CEO was lying?
Mr Rozario bought same numbers of apples and apples oranges in a ratio 2:3, he gave away 2/3 of the apples to his sister. How many apples did Mr Rozario buy?
Suppose the supply and demand for a certain textbook are given by supply p+1/3q^2. Find the demand quantity and the supply quantity at a price of $30 each.
How would you set up a statistical test to determine if there were any changes in the unsafe acts observed?
If hats by leko company produces women's hats so that they fit head circumferences between 21.00 and 25.00 inches, what percentage of women can fit into hats.
Explain how the life cycle affects the development of a new (revised) version of the product for a different market segment and why?
Eight workers are chosen at random to be interviewed about the work environment. What is the probability of choosing all first-shift workers?
Each year there is a 5% chance of expanding operations, what is the percentage over five years that business will expand?
Identify the null hypothesis and the alternative, determine the test statistics and determine the p- value and determine if the evidence support the claim.
Suppose you have 240 feet of fencing with which to build three connected equally sized pens as shown below. What will be the total area of three pens?
What would be a situations in which you could use an excel chart to present your data?