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The null and alternate hypotheses are:H0: μ1 ≤ μ2H1: μ1 > μ2
A random sample of 20 items from the first population showed a mean of 100 and a standard deviation of 15. A sample of 16 items for the second population showed a mean of 94 and a standard deviation of 8.
(a) Find the degrees of freedom for unequal variance test. (Round down your answer to the nearest whole number.)
(b) State the decision rule for .05 significance level. (Round your answer to 3 decimal places.)
Reject H0 if t>
(c) Compute the value of the test statistic. (Round your answer to 3 decimal places.)
(d) What is your decision regarding the null hypothesis? Use the .05 significance level.
Develop a probability distribution for the number of travelers who plan their trips within two weeks of departure.
An orange juice producer buys all their oranges from one particular orchard. The amount of juice from the oranges is approximately normally distributed with a mean of 152 ml. and a standard deviation of 41 ml.
Consider in you response how the concepts of a population (and its associated parameters) and the sample (and its associated estimates) fits into the discussion.
You just saw an ad on television that states the majority of the population would vote to make smoking illegal. The poll that is referenced shows 53% of those asked supported making smoking illegal.
If the market research gave a positive indication the price would be £35,000. If the market research gave a negative indication the price would be only £3,000.
During a professor's office hours, students arrive, on average, every ten minutes. Assume that the distribution of the time between arrivals follows an exponential distribution. Suppose that a student has just left.
Using the 0.10 level of significance, is there evidence that the population mean is above $300?
Would it be sensible to conclude that more than 10% of applicants are now failing the test?
The Globe Fishery packs shrimp that weigh more than 1.91 ounces each in packages marked" large" and shrimp that weigh less than 0.47 ounces each into packages marked "small"; the remainder are packed in "medium" size packages.
If Larry gets a 70 on a physics test where the mean is 65 and the standard deviation is 5.8, where does he stand in relation to his classmates?
If Kim expects to use phone for 21 hours per month, which plan must she choose?
A study is conducted to determine if the traffic light patterns at a busy intersection need to be adjusted to help the flow of traffic. Data on the volume of traffic and the traffic patterns during different times of day are recorded.
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