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Matthew S.'s Resources

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I start college in may and i dont understand anythig about algebra (answer)

If you'll be using a textbook for class, perhaps you can buy it in advance, or gain access to the online textbook so you can begin getting familiar with the concepts in algebra.  That might help lessen your anxiety.  Plus remember you're going into the class to learn; no one expects...

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Bio Stat Question: (answer)

You could do it either way, but I'd learn towards n=48 for all questions since you are repeatedly referring to the 'fast track group'.  There should certainly be an expectation that not all candidates' data can be used; in the 'real world' you'll be tossing data if it is unusable.

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Scientific notation 53030000 (answer)

53030000. is the number in question.  For every position you move the decimal point left, that is a power of 10.  If you move it until the first digit is the only thing left of the decimal point, you will have shifted the decimal place left 7 positions. 53030000 is the same was 5.303...

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(3,-1); y= 2x-8 (answer)

Two lines are parallel to one another if their equations have the same slope.  y=2x-8 has a slope of 2, so we can use that fact plus the given point (3,-1) to solve the problem. Using the equation (y - y1) = m (x - x1), let's add in m, and our point (x1, y1): y - (-1) = 2 ( x -...

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What does n! mean (answer)

n! refers to a factorial, a product of n numbers, each one less than the preceding value. You can write a factorial n! by starting with the number n, multiplying it by one less than the previous number, and repeat until you reach 1, at which time you can stop. So 5! can be written as follows:...

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Compute the surface area? (answer)

Your cylinder formula looks more like the formula for a circle, since there's no mention of a height, z.  You can get to the radius from the generic equation x2+y2=r2; the radius of the circle would appear to be 2.  As for the height, I'm not sure if it matters.  If you assumed...

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4-8x/x+1=8/x+1 (answer)

Is the quantity to the right of the equals sign (8/x) + 1 or 8/(x+1)?  Unfortunately there's no easy way to write out fractions here, so the next best thing is to use parentheses and/or brackets to make it clear what's in the numerator and what's in the denominator.  That helps...

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Calculating three or four of 15 adults (answer)

This is an example of a binomial event and probability distribution.  For each person you select, they are either overweight or not-only two possible outcomes.  If we define 'success' as selecting an overweight person, the probability of success when we select someone is denoted p,...

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Similarities between independent and dependent events (answer)

Suppose you had a bag of 8 marbles, 3 red and 5 blue.  What is the probability of choosing a red marble on the 3rd draw? If the first two marbles are not replaced after being drawn, then the 3rd draw is an example of a dependent event, because, obviously, there won't be 8 marbles in the...

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I don't know how to use a stem and leaf plot. Can you help me? (answer)

The benefit to stem and leaf is that, unlike a histogram, you actually get to see every value in your data set, whereas histograms are based on the counts of data points within certain ranges of numbers that define the bins used to construct the histogram.  Sorting the leaves in ascending...

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Scores for an entry exam to a university...? (answer)

The key here is remembering that a given normal distribution's mean and standard deviation, if not 0 and 1, respectively, requires converting the x values into Z values, to be able to use a Z table to look up the correct probabilities. You also have to determine if the value you looked up matches...

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find the values of theta..... hardest trig Q.. (answer)

Let's use the method you listed above, but we need to correct the formula: (and note "T+a") is not the a that is in the first term, it is an angle, which I will represent with delta, δ): a cos θ + b sin θ = c cos ( θ - δ ) The original equation, if we switch the order...

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How to find a percentage from standard deviation and mean? (answer)

For this problem, you will be using the Z-table to look up probabilities. We know the standard normal distribution has a mean of 0 and standard deviation of 1, but the normal distribution of times given in this problem does not match that for the standard normal (since mean = 36 and sd = 2.5)...

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How to find z-scores? (answer)

The total area under the standardized normal distribution curve is 1.  If you have a textbook handy, there should be "Z-tables" in it that list areas under the curve to the LEFT of the Z-value.  For Z=0, the area to the left of the curve is 0.5000, since the curve is symmetric...

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