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Find the sample proportion and the large-sample margin of error for 95% confidence. Explain in simple terms the meaning of the 95%.
Determine if there is convincing evidence to support the claim that fewer than half of adult Americans can name at least one justice currently serving on the Supreme Court.
If a single potassium measurement is made, what is the probability that Judy is diagnosed as hypokalemic? (b) If measurements are made instead on 4 separate days and the mean result is compared with
The following results are for two independent samples taken from the two populations. What is the value of the test statistic?
worldwide organization of academics claims that the mean IQ score of its members is , with a standard deviation of . A randomly selected group of members of this organization is tested, and the resu
The fastest 10% of the boys with certificates of recognition. What time would the boys need to beat in order to earn a certificate of recognition from the fitness association?
Standard deviation 500and 10, respectively. what is the probability that plane 2 did not catch up to plane one after two hours of flight?
Assume that your students are a sample of all fourth graders in your state and you can use your student data to test some ideas. What is the major problem with your assumption.
The number who will go to the Ohio State University is a binomial random variable. What is the mean number of seniors going to the Ohio State University?
A standard deviation of 7.88 minutes.Using the 0.01 level of significance, is there evidence that the mean shopping time at the supermarket is different from the claimed value of 22 minutes?
American Express sponsored survey that found 355 of 546 business travelers use a laptop computer on overnight business trips? c.) What is the p=value? d.) Use a=.05. What is your conclusion?
A mean of 45 months and a standard deviation of 8 months. if a random sample of 600 batteries is selected, how many batteries would weigh last more than 48 months?
If 4.01% of these DVD players have a life span of more than 8 years, what is the standard deviation of the DVD player's life span?
In a bivariate data on ‘x' and ‘y', variance of ‘x' = 49, variance of ‘y' = 9 and covariance (?x, y) = -17.5. Find coefficient of correlation between ‘x' and ‘y'.
From past experiences X is well aproximated by a normal distribution with mean 45 and variance 100. If an auditor takes a random sample of 36 accounts what is the probability that the mean balance w
A string of 30 identical Christmas tree lights are connected in series to a 120 V source. The string dissipates 81 W. What is the equivalent resistance of the light string?
what is the probability that the sample of ball bearings will have a mean less than 0.798 cm? what is the probability that the sample of ball bearings will have a mean of at least 0.815 cm?
Assume that customers enter a store at the rate of 60 persons per hour. a) what is the probability that during 5 minutes interval no one will enter the store?
if the probability of having a hurricane is 1/5 each year, what is the probability that the hurricane will happen at least once in 5 years.
Assuming that actual speeds of the device are normally distributed, please answer the following questions about a machine set to shoot pucks at 85mph:
Data entries that are on the boundary of two buckets? To elucidate my point, if i hvae buckets of 0.15 size starting at 1, should the data entry 1.15 fall in the first bucket or the second?
A college wants their students to be in the top 12.5% for verbal aptitude. What minimum qualifying score should they set?
You have been studying the effects of different fertilizers on the growth of certain produce. In the latest instalment of your experiment, you are testing Quebec's own "Gro-Haut" fertilizer and its
Calculate the change in the treatment group, the change in the control group, and finally the differences-in-differences estimate. Is the estimate positive or negative?
A randon sample size of 86 is selected from a population whose mean is 40 and standard deviation is 11. Calculate the probability that the same mean will lie within 3 units of the true population m