An agronomist believes that a newly developed fertilizer will increase the mean harvest of eggplants by morethan 2.5 kg. 56 plats were treated with fertilizer and had a mean harvest of 10.5 kg with standard deviation of1.2 kg. 29 plants were untreated and had a mean harvest of 9.25 kg with standard deviation of 0.7 kg.What is the alternative hypothesis of the problem?2.5 kgO b.H = 10.59.25< 10.5 kgOd.9.25 # 10.5 kg

Answered: An agronomist believes that a newly…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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If needed do not use a P value to answer any problem. No credit will be given if a P value is used. Use only criticalvalues.
A concerned consumer believes that they are being cheated in the weight of potato chips per bag. The company claims that every small bag weighs 1 ounce. You weigh 50 different bags of chips and find the average to be .97 ounces. Match the following terms to their meaning in context of this problem. The consumer finds a test result that is NOT statistically significant What is their conclusion?
A drug company claims that their products’ contaminations never vary by more than 2%. Sample of 5 specimens were tested and the percentages of the purities are recorded as Observation no. 1 2 3 4 5 Percentages (%) 98.8 97.2 98.9 97.7 97.9 a. Do the sample data have enough proof to oppose the manufacturer's claim? (HINT: take the range of 2% equal 4o.) b. Find a 90% confidence interval for o?.
Rhino viruses typically cause common colds. In a test of the effectiveness of echinacea, 33 of the 38 subjects treated with echinacea developed rhinovirus infections. In a placebo group, 94 of the 111 subjects developed rhinovirus infections. Use a 0.01 significance level to test the claim that echinacea has an effect on rhinovirus infections. Complete parts (a) through (c) below. a. Test the claim using a hypothesis test. Consider the first sample to be the sample of subjects treated with echinacea and the second sample to be the sample of subjects treated with a placebo. What are the null and alternative hypotheses for the hypothesis test? O A. Ho: P1 #P2 Hy:P1 =P2 O B. Ho: P1 =P2 H1: P1 P2 H1: P1 #P2 Identify the test statistic. (Round to two decimal places as needed.) Identify the P-value. P-value = (Round to three decimal places as needed.) What is the conclusion based on the hypothesis test? the null hypothesis. There sufficient evidence to support the claim that echinacea…
10. An engineering study was undertaken to determine the optimum thickness of aluminum to be used to construct cans to be used for cat food. Cans made of aluminum of thickness 2.10 mm and 1.90 mm were tested to determine the maximum load each would sustain before collapsing. The sample data is summarized below. Use a = 0.05 to test the claim that the thicker cans are stronger (will withstand a higher load). 2.10 mm thick 1.90 mm thick sample size 175 170 mean maximum load (kg) 28.18 26.71 standard deviation of maximum load (kg) | 2.78 2.21
7.05 In an experiment at Virginia Tech, 20 northern oak seedlings were exposed to a fungus. Half of the seedlings received 368 ppm of nitrogen (treatment) during planting, and the other half received no nitrogen (control). The stem weights in grams, at the end of 140 days were recorded as follows: Treat ment | .32 .53 .28 .37 .47 .43 .36 .42 .38 .43 Control .26 .43 .47 .49 .52 .75 .79 .86 .62 .46 Construct a 95% confidence interval for the difference in the mean stem weights between the treatment and control groups. Assume that the under- lying populations are normally distributed with equal variances.
State the conclusion based on the results of the test. The mean of the pressure required to open a certain valve is known to be u = 6.7 psi. Due to changes in the manufacturing process, the quality-control manager feels that the average pressure has changed. The null hypothesis was rejected. Choose the correct answer below. O A. The mean of the pressure has not changed. O B. There is not sufficient evidence that the mean of the pressure required to open a certain valve has changed. O C. There is not sufficient evidence that the mean of the pressure required to open a certain valve has not changed. O D. The mean of the pressure has changed. O E. There is sufficient evidence that the mean of the pressure required to open a certain valve has changed. O F. There is sufficient evidence that the mean of the pressure required to open a certain valve has not changed.
Stoaches are fictional creatures, sometimes mistaken for mome raths. Suppose a two-tailed ? t -test is conducted to test for a difference between the population means of adult female stoach weights and adult male stoach weights. The female sample has 6 weights, and the male sample has 12 weights. The ? t -statistic for the test is -2.69933. What is the ? p -value? (Give your answer to 4 decimal places.)

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