Does nature heal best a contrast optional the researchers, Ask an Expert

Statistics

Does nature heal best? A contrast (optional). The researchers who carried out the study of healing in newts described in the previous exercise conjectured that healing is fastest under natural conditions. If this is true, the population mean for the 1 group (natural field level) in Table 29.5 should be larger (or less negative) than the average of the population means for the other four groups.

(a) What population contrast expresses this comparison? What null and alternative hypotheses in terms of this contrast should the researchers use to test their conjecture?

(b) Carry out the test and state your conclusion.

(c) After you see the five sample means, it is tempting to contrast the average for the 1 and 1.25 groups with the average for the other three groups. Explain carefully why this is not legitimate.

View complete question

Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M91772736

Have any Question?Write your Review or question?

Related Questions in Statistics and Probability

A running shoe company wants to sponsor the fastest 3 of

A running shoe company wants to sponsor the fastest 3% of runners. You know that in this race, the running times are normally distributed with a mean of 6.8 minutes and a standard deviation of 0.37 minutes. How fast woul ...

Your supervisor comes to you and says she would like a

Your supervisor comes to you and says she would like a marketing research study. She says there is a budget of $30,000. She would like to conduct a simple random sample of consumers interested in using the services of th ...

Two candidates face each other in an election the

Two candidates face each other in an election. The Democratic candidate is supported by 58% of the population, and the Republican candidate is supported by 42%. In other words, if you randomly chose a voter and asked the ...

On average the parts from a supplier have a mean of 975

On average, the parts from a supplier have a mean of 97.5 inches and a standard deviation of 12.2 inches. Find the probability that a randomly selected part from this supplier will have a value between 85.3 and 109.7 inc ...

Assume that the critic finds that 50 percent of the movies

Assume that the critic finds that 50 percent of the movies have positive comments about the plot, 50 percent have positive comments about the acting, and 30 percent were not given positive comments about either plot or a ...

Someone reasons that when a coin is tossed there are three

Someone reasons that when a coin is tossed, there are three possible outcomes: it comes up heads or tails or it lands on it edge. With three outcomes on each toss, the fundamental counting rule suggests that there are ni ...

In february 2017 the risk-free rate was 431 percent the

In February 2017 the risk-free rate was 4.31 percent, the market risk premium was 6 percent, and the beta for Twitter stock was 1.58. What is the expected return that was consistent with the systematic risk associated wi ...

A forest type consists of three species of trees25 are

A forest type consists of three species of trees: 25% are Douglas-fir 40% are Hemlock 35% are Western Red Cedar a) What is the probability that a tree selected at random will be a Douglas-fir? b) What is the probability ...

A researcher selects from a participant pool of 8 males and

A researcher selects from a participant pool of 8 males and 11 females. He determines that the probability of selecting 2 female participants is p = .335. Based on this probability, what strategy did the researcher use t ...

1the r-squared of a linear regression model is equal to the

1)The R-squared of a linear regression model is equal to the proportion of the variance of the target explained by a linear regression model. 2). The R-squared of a linear regression model is equal to the proportion of t ...

4,153,160 Questions Asked
13,132 Experts
2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Recent Questions

Ask Statistics and Probability Expert