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The average flight from point A to point B takes 100 minutes with a standard deviation of 10 minutes. What is the probability that a flight will take more than 95 minutes?
The probability of getting a defective widget is .10. You select five widgets for the National Widget Championship
Suppose there are 10 drawers, each containing two coins. Drawers 1 and 2 contain only gold coins, while in drawers 3;4 and 5 one is a gold coin and the other one is a silver coin, and rest of the dr
Using symbols, state the hypotheses (H0 and H1) for a two-tailed test. Find the critical value/region for an ? = .01 for a two-tailed test. Calculate the test statistic (t-statistic) for the sample.
Refer to the Buena School District bus data. Develop a 95 percent confidence interval for the mean bus maintenance.
Suppose that a hypothesis test is performed at a small significance level. State the appropriate conclusion in each case by referring to Key Fact 9.2. Key fact 9.2= If the null hypothesis is rejecte
An experiment was designed to compare several different types of air pollution monitors. The monitor was set up, and then exposed to different concentrations of ozone, ranging between 15 and 230 par
If my question of interest is if cactus needles are smaller the closer they are to a human trail, what would be a good null and alternative hypothesis?
The distribution of a population of mechanical aptitude test is normal, with a mean of 46 and a standard deviation of 4. To test the impact of a job training program, a sample of 26 scores was obtai
What is the probability of a randomly selected person having an IQ score about 80%? What is the probability of a randomly selected person having an IQ score between 120 and 130
Suppose that we want to estimate the proportion of recipes in the Better Homes and Gardens New Cook Book that do not involve animal products. We plan to take a simple random sample of the N=1251 kit
Two-way Anova between subjects anova is preformed when you have
Convert the following SAT scores into new distributions with a mean of 50 and a standard deviation of 2.
You are an engineer in charge of aircraft safety. You want to ensure that the probability of failure between inspections is no more than 1% for each aircraft. How would you revise the inspection You
What is the central limit theorem? According to the central limit theorem the expected value for a sample mean is ________ as the sample size approaches infinity? WHY?
A random sample of n = 16 scores is obtained from a population with a mean of µ = 80 (assume ? is unknown) and a treatment is administered to the sample. After treatment, the sample mean is fo
How does variablity in a population influence standard error of the mean? if you were studying the effect of puppies on happiness, a variable with a large standard deviation, how would you adjust yo
The mean amount consumed was 46.2 oz. Assuming the amount of water consumed daily by adults is normally distributed and the standard deviation is 11.5 oz, is there sufficient evidence to show that
The image of the public library is constantly changing, and their online services continue to grow. Usage of the library's home page grew by 17% during the past 12 months. It has been estimated that
Create a game of chance using a coin, dice, or a standard deck of cards. Choose how to play the game and determine at least two ways to win. Then determine the probability of winning the game. Then
A standardized achievement test provides a distribution of scores with a mean of 200 and a standard deviation of 25. A researcher has taken two independent samples of scores.
In a test of the hypothesis that alcohol consumotion affects reaction time, a reasearcher reports that an alpha lever of .05 the null hypothesis was rejected.
An engineer commutes daily from his suburban home to his midtown office. The average time for a one way trip is 24 minutes, with a standard deviation of 3.8 minutes. Assume the distribution of trip
A distribution is composed of the short-term memory scores of 79 people. The distribution has a mean of 56 and a standard deviation of 4. If all the scores are converted to z-scores and these z-sco
A radio transmission tower is designed for a "50 year wind." This means that is there is a certain high wind velocity with a return period of 50 years.