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The data displayed below represents the electricity cost during a recent month for a random sample of 50 one-bedroom apartments in a large city.
If 500 people are surveyed at random, what is the probability that at least half the people surveyed do not favor ice cream.
In a sample of 50 workers in city B, 6 were unable to read. Can it be concluded that there is a difference in the proportions of nonreaders in the two cities? Use α = 0.05.
A recent poll of 700 people who work indoors found that 278 smoke. If the researchers want to be 98% confident of their results to within 3.5 percentage points, how large a sample is necessary?
Given the following data on Seven Seas Sales: Type of Boat Observed Sales Expected Sales expected observed. The degrees of freedom for this chi-squared test is?
The mean noise level in the 171 ward areas was 58.0 decibels, and the population standard deviation is 4.8. Find the 90% confidence interval of the true mean.
The distribution is approximately normal. If an employee is picked at random, what is the probability that the employee has worked at the store for over 10 years?
Unit shipping costs for the four products are $5,$2,$4, and $10, respectively. What is the weighted mean for shipping cost per unit?
Find the average of the three trials, so the correct number of significant figures, and decide if these measurements gave an accurate result.
Of the households in the U.S, 18 million or 17% have 3 or more vehicles. If two U.S households are randomly selected, find the probability that both will have three or more vehicles.
The example that I created last week was forecasting customer demand for foreign sheets of commercial grade printing paper.
We want to do a normal approximation to the binomial distribution of the number of employees who leave each year. What is the probability that fewer than 100 employees will leave the company?
At the alpha equals .10 level of significance, can the firm conclude that Chicago households buy more online than Milwaukee. Do a formal Hypothesis test. (all 7 steps) Interpret the meaning of p val
When those 15 valuse are added, then didvided by 15, the result is $29,143.11. Is $29,143.11 the average per captia income for all individuals in the 15 states? Why?
Suppose we analyzed the effect of grade point averages on grades in a specific class and found the results to have an R-aquared value of 0.53. What do we know? Are there other factor, neith or fifty
Assume you have the following data: H1: µ ? 200, S =30, n = 64, and X =218. Conduct a two tailed hypothesis test at the 0.05 significance level.
Find the probability that 11 or more have never been a victim of a violent crime. Does it seem reasonable that 11 or more have never been victims of violent crimes?
Given that Z is a standard normal random variable, what is the value of Z to the left of Z = 0.0559?
If 100 random samples of size n were drawn and, if, for each, a 99% confidence interval for μ was computed, then exactly 99 of these confidence intervals would contain the true population me
A random sample of mens soccer shoes from an international catalog had the following weights (in ounces). At a=0.05 can it be concluded that the average weight is less than 10 ounces?
If 22 tickets are sold and 2 prizes are to be awarded, find the probablilty that one person will win two prizes if that person buys 2 tickets.
Explain how the concept of statistical independence might be applicable here. How would the airline decide whether, say, expenditure of $100,000 would be justified for a backup system to prevent
Compute the p-value corresponding to the value of the calculated test statistics from Show the Numeric Expression used and comment on the p-value.
To test the effect of sample size in a normal distribution with μ=100 and σ=12, determine the probability of finding Xbar=95 or lower with N=4.
In about 250 words, describe how linear regression analysis could be used in your organisation or any organisation that you are familiar with.