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A simple random sample of 12 e-readers of a certain type had the following minutes of battery life.
287, 311,262, 392, 313, 311,316, 286,302,336,291
assumed that it is reasonable to believe that the population is approximately normal and the population standard deviation 63. what is the upper bound of the 95% confidence interval for the battery life for all e-readers of this type?
Airplane Safety: Suppose that 62% of all adults think that airplanes would be safer places if pilots carried guns. An opinion poll plans to ask an SRS of 1009 adults about airplane safety.
What is the difference between the null and alternative hypothesis statements in one tailed and two tailed tests? How can manufacturing companies use the standard normal distribution to determine quality control of their products?
What proportion of time is the machine down due to a type 1 failure? What proportion of time is the machine down due to a type 2 failure? What proportion of time is it up?
Explore the descriptive statistics and draw some scatter plots. Does this meet the basic assumptions of regression?
BMI in children is approximately normally distributed with a mean of 24.5 and a standard deviation of 6.2. A BMI between 25 and 30 is considered overweight. What proportion of children are overweight?
A new weight-watching company, Weight Reducers International, advertises that those who join will lose, on average, 10 pounds the first two weeks with a standard deviation of 2.8 pounds.
the sample variance 1.8 hours. If μ= 3.0, then calculate the observed value for the t-statistic. Construct 90% confidence interval for the mean.
Given below is the rate of return for one year (reported in percent) for the sample of 12 mutual funds. Using .05 significance level is it sensible to conclude that mean rate of return is more than 4.50 percent?
The t-statistics that was obtained in the study of 400 subjects was t=20, rejecting the null hypothesis and showing that the drug has a beneficial effect. Why was management upset?
A certain state lottery awards 418 prizes; 28-$200 prizes, 120-$25 prizes and 270-$20 prizes, for every 10,000 tickets sold.
For each of the following three scenarios, state which hypothesis test you would use from among the four introduced so far: the z test, the single-sample t test, the paired-samples t test, and the independent-samples t test.
In a group of six professors selected at random, what is the expected number of extroverts? What is the standard deviation of the distribution?
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