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A club with 31 members is voting on a proposal. A group of 4 has decided to vote in favor of the proposal while each of the rest of the members vote independently with a chance of 42% in favor of the proposal. What are the chances that the proposal will get the majority vote?
Suppose that we generate a random sample from a given dis- tribution. If it is desired that the probability that the sample mean will be within 2 standard deviations of the mean of the distribution is at least .99, how large should the sample size..
Compute a Pearson's correlation coefficient for these data and determine whether the correlation is significant.
Assume that sigma = 60, choose an alpha level, and perform a hypothesis test to determine whether this is good evidence to conclude that the mean score for all young men is less than 275.
Sales are above 671,000 copies, and 10% of the time, sales are above 712,000 copies. Find the mean and the variance of annual sales.
What assumption about the population distribution is needed in order to conduct the t test.
a company is studying the feasibility of buying an elevator for a building under construction. one proposal is a
Shank's, Inc., a nationwide advertising firm, wants to know whether the size of an advertisement and the color of the advertisement make a difference in the response of magazine readers.
Makaela took a spanish exam; her grade was 79. The distribution was normally shaped with xobt =70 and s = 12. Jaun took a history exam; his grade was 86
A researcher is conducting proportionate stratified random sampling with a sample size of 250. Approximately how many people should be sampled from each stratum?
when a certain manufacturing process is correctly adjusted the length of a machine part produced is a random variable
Estimate the probability that the machine will overflow an 8 oz cup.
30 in Canada, and 6 in the United State. At level of significance 0.05, test whether the distribution of sales has changed from last year.
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