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(a) Use the data to find a point estimate for the mean. $ (b) Use the data to find a point estimate for the variance. $ (c) Use the data to find a point estimate for the standard deviation. $
A and B flip coins. A starts and continues flipping until a tail occurs at which point B starts flipping and continues until there is a tail. then A takes over and so on. Let P1 be the probability o
A sample of 55 night-school students' ages is obtained in order to estimate the mean age of night-school students. x = 25 years. The population variance is 22.
In a test of a gender-selection technique, results consisted of 276 baby girls and 252 baby boys. Based on this result,what is the probabilty of girl born to a couple using this technique?
Two population t-test. Are the two methods yield different conclusion? Why or Why not?
Calculate the ANOVA table. Test if the three fertilizer equivalent using the following methods: Assume 5% level of significance.
Suppose that college faculty with the rank of professor at tow-year institutions earn an average of $64,571 per year with a standard deviation of $4,000. In an attempt to verify this salary level, a
According to the Sleep Foundation, the average night's sleep is 6.8 hours (Fortune, March 20, 2006). Assume the standard deviation is .4 hours and that the probability distribution is normal.
Is there a linear correlation between the age of the student and the stress level?
The random variable X, representing the number of accidents in a certain intersection in a week, has the following probability distribution:
Use a .05 level of significance and the sample data to test the hypothesis that the overall proportions for the colors are as stated above. What is your conclusion?
Suppose we select an SRS of size n = 100 from a large population having proportion p of successes. Let p be the proportion of successes in the sample. For which value of p would it be safe to use th
A die is rolled 24 independent times. Let Y be the sum of the 24 resulting values. Recalling that Y is a random variable of the discrete type approximate: (a) P(Y >= 86) (b) P(Y < 86) (c) P(70
The estimate of the slope is? The estimate of the y-intercept is? The prediction for the sales for a broker who brings in 25 clients is?
Obtain a point estimate of the mean number of rolls of a die before a 1 is observed. The population standard deviation for the number of rolls before a 1 is observed. Use this result to construct a 9
It is reported that 25 percent of American households use a cell phone exclusively for their telephone services. In a sample of 11 households, find the probability that:
What is the probability that exactly one vehicle requires warranty service? Exactly two vehicles require warranty service? Compute the mean and standard deviation of this probability distribution.
Use this information to develop linenar equation in slope-intercept form. In developing the equation, think of 1980 as year zero let x be the time in years and let y be the population density, Write
The specifications on an electronic component in a target acquisition system are that its life must be between 5,000 - 10,000 h. The life is normally distributed with mean 7500 h. The manufacturer r
Two different manufacturing processes can be used, both of which have the same mean life. However the standard deviation of life for process 1 is 1000 h, where as process 2 is only 500 h. Production
Is the alternative hypothesis independent or dependent? State the test statistic from minitab: (Enter to 3 decimal places). Determine the number of degrees of freedom:
A small private golf driving range has 6 different teeing stalls. Below is the usage for each stall recorded during one summer week. Determine if there is equal usage of all teeing stalls at the alp
What is the realtion between the significance level of a hypothesis test and the probability of making a type 1 error?
Consider the following. (Give your answers correct to two decimal places.) (a) Determine the value of the confidence coefficient z(?/2) for 1 - ? = 0.88.
Show that due to the orthogonality of the regressors also the estimated coefficients BETA(hat)1 and BETA(hat)2 are uncorrelated, i.e. show that cov(BETA(hat)1, BETA(hat)2) = 0.