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The calcium (Ca) content of a powdered mineral substance was analyzed 10 times with the following percent compositions recorded:
0.0271 0.0282 0.0279 0.0281 0.0268
0.0271 0.0281 0.0269 0.0275 0.0276
a. Find a 99% confidence interval for the true calcium content of this substance.
b. What does the phrase "99% confident" mean?
c. What assumptions must you make about the sampling procedure so that this confidence interval will be valid? What does this mean to the chemist who is performing the analysis?
The number of children, x, belonging to each of eight families registering for swimming was 2, 2, 2, 4, 2, 1, 2, 2. Find the mean, x. (Give answer correct to 2 decimal places.)
Use the applet to calculate the power of the test against the alternative u = 122. Can the test be relied on to detect a mean that differs from 128 by 6?
has the percentage of registered nurses earning more advanced academic degrees changed? in 1980 55 of registered nurses
The probabilities of two events X and Y are 0.4 and o.6 respectively.- What are the conditional probabilities of X and Y occurring, given that A, B or C has already occurred?
Are these events mutually exclusive? Why or why not? What is the probability of eating potato salad given that a person was a case? Show your work
two friends decide to go to the track and place some bets. one friend remarks that in an upcoming race the number 8
Thermometers are normally distributed with a mean of O Celsius and a standard deviation of 1. OO Celsius, Find the probability that a randomly selected thermometer reads between - 2.23 and - 1.25 and draw a sketch of the region. The probability is..
How many bolts should be sampled in order to make us 95% confident that the sample mean bolt length is within .02 inches of the true mean bolt length?
What is the probability that a randomly selected group of 50 shoppers will spend a total of more than $5700? The total will be more than $5700 when the sample average exceeds what value?
The table shows the results of a survey im which 180 family were asked if they own a home and if they will be purchasing a new vehicle this year.
The sample mean X will be used to estimate. Determine the probability that the estimate will be off by less than .2 oz. Assume that the SD of the fills is .8 oz.
The population variances are 4.6 and 5.0 respectively. Using a level of significance of .05, is there evidence that the dual degree students are receiving lower grades? Fully explain your answer.
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