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A study found that the average time it took a person to find a new job was 3.5 months. If a sample of 30 job seekers was surveyed, find the 90% confidence interval of the mean. Assume the standard deviation of the sample is 0.5 month.
Conceptually we would expect the probability of newborn males and females to be the same. However, census reports indicate that the ratios of males and females in various countries do not conform to the theoretical prediction.
Last week Sarah had exams in Math and in Spanish. On the Math exam, the mean was u, = 30 with a = 5, and Sarah had a score of X - 45. On the Spanish exam, the mean was u, = 60 with 0 = 6 and Sarah had a score of X = 65. For which class must Sarah ..
Standard deviation = 30 (Source: U.S. National Center for Health Statistics). Levels above 200 warrant attention. Find the probability that a teenage boy has a cholesterol level greater than 200.
1. use a scatterplot and the linear correlation coefficient r to determine whether there is a correlation between the
experiments have shown that when a clean tungsten surface is heated by laser irradiation using a focused ruby laser the
What is the null hypothesis? Use a = 0.05 .
At a state political rally, a spaker announced "we should raise test scores so that the students are above the state median". How would you analyze this statement?
Construct a 90% two-sided confidence interval onthe difference between the proportion nonconforming in processes 1 and 2. Based on this confidence interval, can you conclude at a significance level of 10% that the difference is not equal to 10%? W..
A manufacturer of car batteries claims that his batteries will last, on average, 3 years with a variance of 1 year. If 5 of these batteries have lifetimes of 1.9, 2.4, 3.0, 3.5, and 4.2 years
Use the interaction plot to argue that the new design is less sensitive to changes in environmental conditions (temperature and humidity). What limitations apply to this argument?
An elementary school principal would like to know how many hours the students spend watching TV each day. A sample of n = 25 children is selected, and a survey is sent to each child's parents.
a residential heat pump with a coefficient of performance of 2.2 delivers energy to the dwelling at a rate of 23 kw.
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