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1. Students often incorrectly believe that inference for a population proportion based on the sample proportion is always valid if n > 30. They are confusing a general rule of thumb for the Central Limit Theorem which says that as the sample size, n, gets large becomes Normally distributed with a different rule for proportions. The correct rule for proportions is that we can create confidence intervals for p based on if
A. n is at least 10.B. there are at least 15 successes and 15 failures.C. np = 5 and n(1 - p) = 5.
2. A sample of 75 students found that 55 of them had cell phones. The margin of error for a 95% confidence interval estimate for the proportion of all students with cell phones is
A. 0.084.B. (0.633, 0.833).C. 0.100.
A recent report in Business Week indicated that 20 percent of all employees steal from their company each year. If a company employs 50 people, what is the probability that: Fewer than 5 employees steal?
Assuming that X is a normal R.V. with mean 1000 and variance 2500, find the probability that a resistor picked at random will be rejected.
In a certain college, 20% of the physics majors belong to ethnic minorities. If 10 students are selected at random from the physics majors, what is the probability that exactly 2 belong to an ethnic minority?
When calculating confidence interval estimates...how is the x and standard deviation calculated? How to calculate one sided 95% confidence limits for a proportion.could you provide a formula ?
The information that the distribution of the serve speeds was bell shaped. What proportion of the player's serves are expected to be between 107 mph and 118 mph?
Variance of 4.2 and mean of 23.2 were calculated. Find out 95% confidence interval on mean and standard deviation. Describe any potential problems with this analysis.
A standard deviation of 50. If an applicant is randomly selected, find the probability of a rating that is between 170 and 220. help solve statistics.
Choose any Statistic business problem and develop a problem statement which can be addressed with survey research. Prepare a 10-13 question survey to collect primary data regarding your selected problem statement.
A confidence interval with a 95% confidence level for the proportion of voters who are in favor of the proposition in a referendum is (0.71, 0.77). How many persons were surveyed in this poll?
If a simple random sample of 50 players was taken, what is the probability that the sample mean will exceed $210,000?
Their probabilities for success on a single play are p for A and q for B, and successive plays are independent. Determine the probablity that A wins the contest given A plays first.
Use the steps of hypothesis testing, (b) figure the effect size for the study; and (c) explain your answers to parts (a) and (b) to someone who has never had a course in statistics.
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