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A student determines the density of a solid with a pycnometer at 25 degrees Celsisus. The weight of the empty dry pycnometer is 6.2330g. Some of the solid material is introduced; the weight of the pycnometer plus solid is 39.4156g. Water is added to fill all space not occupied by the solid; the weight of the pycnometer plus solid plus water is 46.1357g. The pycnometer is emptied and filled with water only; the weight is 19.7531g. The student's estimated 95 percent confidence limit of error in any single weighing is 0.0020g. Calculate the density and its 95 percent confidence limit of error, and present it and its limit of error in proper form with the correct number of significant figures and proper units.
events a and b are mutually exclusive. suppose event a occurs with probability 0.29 and event b occurs with probability
the 70-year long-term record for weather shows that for new york state the annual precipitation has a mean of 39.99
In a group of six professors selected at random, what is the expected number of extroverts? What is the standard deviation of the distribution?
If there is a negative dependent variable of -0.55, and independent variables Y1 of +0.75 and Y2 of -3.0, how do I interpret the relationships according to the signs?
A report states that 73% of home owners had a vegetable garden. How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 0.03 with 98% confidence?
a 6-faced die is rolled two times. let a be the event that the outcome of the first roll is greater than 4. let b be
A sample size n=100 is taken from a population that has a proportion p= 1/5. If, in the sample, ^p=0.25, will the 95% confidence interval for p contain the true value of p^is at top p at bottom ^p
the shelf life of a battery produced by one major company is known to be normally distributed with a mean life of 3.5
for each of the following statements give the null hypothesis ho and the alternate hypothesis h1.1. the mean
A bag of jelly belly candies contains the following colored jelly beans: red (10), blue (2), orange (5), brown (21), green (0), and yellow (18). Construct the probability distribution for x.
an independent-measures research study uses two samples each with n 12 participants. if the data produce a t statistic
A statisitcs professor plans classes so carefully that the lengths of her classes are uniformly distributed between 45.0 and 55.0 minutes. Find the probability that a given class period runs less than 50.5 minutes.
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