Mathematics, 15.04.2020 22:44 tburlew01
A random sample of soil specimens was obtained, and the amount of organic matter (%) in the soil was determined for each specimen, resulting in the accompanying data. 1.10 5.09 1.20 3.50 0.69 4.47 0.97 1.59 4.60 5.02 4.67 5.22 3.31 1.17 0.76 0.32 0.55 1.45 0.14 4.47 2.69 3.98 3.17 3.03 2.21 1.17 1.57 2.62 1.66 2.05 The values of the sample mean and sample standard deviation are 2.481 and 1.616, respectively. Suppose we know the population distribution is normal, does this data suggest that the true average percentage of organic matter in such soil is something other than 3%? Carry out a test of the appropriate hypotheses at significance level 0.10 using the P-value method.
Answers: 3
Mathematics, 21.06.2019 20:30
Diane’s bank is offering 5% interest, compounded monthly. if diane invests $10,500 and wants $20,000 when she withdrawals, how long should she keep her money in for? round to the nearest tenth of a year.
Answers: 2
Mathematics, 21.06.2019 21:30
In a test for esp (extrasensory perception), a subject is told that cards only the experimenter can see contain either a star, a circle, a wave, or a square. as the experimenter looks at each of 20 cards in turn, the subject names the shape on the card. a subject who is just guessing has probability 0.25 of guessing correctly on each card. a. the count of correct guesses in 20 cards has a binomial distribution. what are n and p? b. what is the mean number of correct guesses in 20 cards for subjects who are just guessing? c. what is the probability of exactly 5 correct guesses in 20 cards if a subject is just guessing?
Answers: 1
A random sample of soil specimens was obtained, and the amount of organic matter (%) in the soil was...
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