A population is known to have a mean of µ = 45. A treatment is expected to increase scores for individuals in this population. a. Determine if you should use a one or two-tailed hypothesis test. b. Write your null and alternative hypothesis in words. c. Write your null and alternative hypothesis in numbers and symbols (AKA as an equation)

You will conduct a post hoc test when ______.   a. you suspect one of your sample means is different from other samples   b. you suspect two of your sample means are different from each other   c. your main effect is significant.   d. your main effect is not significant

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The mean entry-level salary for an employee at a company is $40,000. You believe it is lower for entry-level IT professionals in the company.1. Identify the null hypothesis.             2. Identify the alternative hypothesis.    3. Identify the type I error. A. You decide that the mean entry-level salary for IT professionals is $40,000, when, in actuality, the mean entry-level salary for IT professionals is $40,000. B. You decide that the mean entry-level salary for IT professionals is $40,000, when, in actuality, the mean entry-level salary for IT professionals is lower than $40,000. C. You decide that the mean entry-level salary for IT professionals is lower than $40,000, when, in actuality, the mean entry-level salary for IT professionals is $40,000. D. You decide that the mean entry-level salary for IT professionals is lower than $40,000, when, in actuality, the mean entry-level salary for IT professionals is lower than $40,000. 4. Identify the type II error. A. You decide that…

A baseball team claims that the mean length of its games is 2.8 hours. State Ho and H, in words and in symbols. Then determine whether the hypothesis test for this claim is left-tailed, right-tailed, or two-tailed. Explain your reasoning. State the null hypothesis in words and in symbols. Choose the correct answer below. O A. The null hypothesis expressed in words is, "the mean length of a baseball team's games is 2.8 hours." The null hypothesis is expressed symbolically as, "Ho: u= 2.8." O B. The null hypothesis expressed in words is, "the mean length of a baseball team's games is at least 2.8 hours." The null hypothesis is expressed symbolically as, "Ho: u22.8." OC. The null hypothesis expressed in words is, "the mean length of a baseball team's games is at most 2.8 hours." The null hypothesis is expressed symbolically as, "Ho: uS2.8." O D. The null hypothesis expressed in words is, "the mean length of a baseball team's games is more than 2.8 hours." The null hypothesis is expressed…

This procedure enables us to decide with the statistical hypothesis. a.Statistical hypothesis b.Level of confidence c.Test of the hypothesis d.Null hypothesis choose the best answer thank you so much

need help with C

9.15 Toxic Mushrooms? Cadmium, a heavy metal, is toxic to ani- mals. Mushrooms, however, are able to absorb and accumulate cad- mium at high concentrations. The Czech and Slovak governments have set a safety limit for cadmium in dry vegetables at 0.5 part per million (ppm). M. Melgar et al. measured the cadmium levels in a random sample of the edible mushroom Boletus pinicola and pub- lished the results in the paper "Influence of Some Factors in Toxi- city and Accumulation of Cd from Edible Wild Macrofungi in NW Spain" (Journal of Environmental Science and Health, Vol. B33(4), pp. 439-455). A hypothesis test is to be performed to decide whether the mean cadmium level in Boletus pinicola mushrooms is greater than the government's recommended limit.

A college counselor wants to perform the hypothesis test H0 : p = 0.50, Ha: p > 0.50, where p is the proportion of undergraduate students who eat breakfast. In a sample of 446 students, 246 ate breakfast.  What is the P-value for this hypothesis test?   a .0147 b .9853 c .552 d .448

What are the correct answers?