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You are a travel agent and wish to estimate, with 98% confidence, the proportion of vacationers who use an online service or the internet to make travel reservations. Your estimate must be accurate within 4% of the population proportion.
(a) No preliminary estimate is available. Find the minimum sample size needed.
(b) Find the minimum sample size needed, using a prior study that found that 35% of the respondents said they used an online service or the Internet to make travel reservations.
A confidence interval for the population mean tells us which values of mean are plausible (those inside the interval) and which values are not plausible (those outside the interval) at the chosen level of confidence.
If all the other quantities remain the same, how does the indicated change affect the width of the confidence interval?
Temperature in a certain city for the month of June follows a uniform distribution over the interval 61º F to 91º F. What is the probability that a randomly selected June day has a temperature that exceeds 70º F?
When using the normal distribution (empirical rule) to obtain the bounds for 99.73 percent of the value in a population, the interval generally will be ______the interval obtained for the same percentage if Chebyshev's theorem is assumed., shorter..
In a completely randomized experimental design, 18 experimental units were used for the first treatment, 10 experimental units were used for the second treatent, and 15 experimental unites were used for the first treatment.
Compute the two groups using Paired sample t-test. Compute which modification reduced the number of traffic accidents
Compute the relative frequencies and percentages for all classes. Draw a histogram and a polygon for the relative frequency distribution.
Consider the event "Ray is in the garage" and the event "Felix is not in the garage." Are these events mutually exclusive? What is the mean number of cats in my garage at 4:00 pm?
Scenario: Dole Pineapple, Inc., is concerned that the 16-ounce can of sliced pineapple is being overfilled. Assume the standard deviation of the process is .03 ounces.
Using the scatter diagram (no calculations), would you estimate the linear correlation coefficient to be positive, close to zero, or negative?
What test can be performed to compare the percentage of participants who developed abnormal triglyceride levels between the vitamin A and the trace group? Report a two-tailed p value.
A marketing firm asked a random set of married and single men as to how much they were willing to spend for a vacation. At = .05, is a difference in the two amounts?
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