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Q1. The grades of 20 students are listed below. Use the stem & leaf to determine the shape of the distribution. Choose the best answer.
4 | 45 | 6 86 | 5 7 97 | 1 5 7 8 8 98 | 3 4 5 7 8 8 99 | 7
Q2. A researcher is considering using 90% confidence interval for his research project instead of 95%. What happens to the required sample size if the confidence level is decreased from 95% to 90% and the same error margin is allowed in each case?
Q3. Horse race time is found to be normally distributed with a mean value of 18 minutes and a standard deviation of 4 minutes. Horses whose race time is in the top 6% will not be eligible to participate in a second round. What is the lowers race time that makes a horse losses his eligibility to participate in a second round?
Q4. A class containing 25 students 12 of them are females. In how many ways can we select a group of 6 male students?
Q4. Research shows that the life time of Everlast automobile tires is normally distributed with a mean value of 65,000 miles and a standard deviation of 6,500 miles. What is the probability of having a tire that lasts more than 75,000 miles?
Cans of Paint Purchased During a recent paint sale at Corner Hardware, the number of cans of paint purchased was distributed as shown. Find the mean, variance, and standard deviation of the distribution.
q1. a survey was conducted in five countries.the percentages of respondents who said that they eat out once a week or
What internal and external threats are and could you provide some examples of what would be considered a threat to internal and/or external validity of a study design.
What is the probability that none of the three parents condones spanking as a regular form of punishment for their children? Give the mean and standard deviation of x. Interpret the results.
The following survey questions have been established for a medical errors and patient safety business research paper:
What is the actual formula for finding the exact probability from the z-score without having to use the table?
In the class, there are 17 females (of whom 8 are freshmen) and 16 males (of whom 7 are freshmen). If one student is selected at random, what is the probability of selecting a freshmen or a female?
Why is such information important to the business?
A bag of jelly belly candies contains the following colored jelly beans: red (10), blue (2), orange (5), brown (21), green (0), and yellow (18). Construct the probability distribution for x.
Find the equation of linear regression for the above data and obtain the expected salary for an engineer with 45 years of experience. Round to the nearest $100.
Find the probability that when 236 reservations are accepted for Flight 107, there are more passengers showing up than there are seats available.
The profit from each type of dealership, given the availability of gas is shown in the following payoff tableCompact Cars $300000 $150000. Construct a decision tree for the situation described above and indicate the best decision.
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