Math Answers

The following represent the scores of a group of students on two tests. calculate spearman rs and kendall's tau for these data. Test 1 - 36, 34, 33, 29, 29, 28, 28, 28, 24, 22, 19, 12 and Test 2 - 18, 26, 24, 18, 15, 12, 14, 13, 12, 10, 8,9

The following represent the scores of a group of students on two tests. calculate spearman rs and kendall's tau for these data.

Test 1 - 36, 34, 33, 29, 29, 28, 28, 28, 24, 22, 19, 12

Test 2 - 18, 26, 24, 18, 15, 12, 14, 13, 12, 10, 8,9

what happens to the variance of the sampling distribution of the sample means when the sample size increases

A box contains 18 light bulbs. Of these, four are defective. Five bulbs are chosen at random. What is the probability that four are defectives?

2. The owner of a factory that sells a particular bottled fruit juice claims that the average capacity of their product is 250 ml. To test the claim, a consumer group gets a sample of 100 such bottles, calculates the capacity of each bottle, and then finds the mean capacity to be 248 ml. The standard deviation is 5 ml. Is the claim true?

FIND THE VALUES FOR EACH OF THE FF. CASES:

A. UPPER TAIL AREA OF 0.025 WITH DEGREE OF FREEDOM=28

B. LOWER TAIL AREA OF 0.01WITH DEGREE OF FREEDOM=15

C. WHERE 90% OF THE AREA FALLS BETWEEN THESE TWO t-VALUES WITH df=9

let x be a random variable with probability density function given by f(x)=(2he^-1/4x ; 0<x find the value of constant h

The amount of theatregoers has declined 18.7 %. By how many percent must the ticket price be raised to keep the proceeds from ticket sales unchanged? The answer has 2 decimals

The estimate for building a summer cottage was 99191 €, out of which the share of building materials was 64136 € and the share of wages 17410 €. The rest of the money was reserved for other expenses. After the cottage was finished, the builder discovered that the cottage as a whole costed 26.7 % more than estimated. The price of building materials was 7.8 % higher than estimated, but the wages were only 83.1 % of the estimate. By how many percentage points did the proportion of other expenses out of the total expenses change? Remember to indicate a negative change with a minus sign (e.g. -10.55). The answer has 2 decimals

In a certain year, the advertising expenses were 23.6 % of the total expenses. In the following year, other expenses increase 5.3 %, but the rising of the total expenses can only be 1.25 %. How many percents, in this case, must the company reduce the advertising expenses? The answer has 2 decimals