Guinea pig lifetimes, Use the Welch t -tools to find a

Guinea pig lifetimes

Assignment Help Basic Statistics

Reference no: EM131012023

1. Guinea Pig Lifetimes. Use the Welch t -tools to find a two-sided p-value and confidence inter- val for the effect of treatment on lifetimes of guinea pigs in Chapter 2, Exercise 11. Does the additive treatment effect seem like a sensible model for these data?

2. Schizophrenia Study. (a) Draw a histogram of the differences in hippocampus volumes in Display 4.12. Is there evidence that the population of differences is skewed? (b) Take the logarithms of the volumes for each of the 30 subjects, take the differences of the log volumes, and draw a histogram of these differences. Does it appear that the distribution of differences of log volumes is more nearly symmetric? (c) Carry out the paired t -test on the log-transformed volumes. How does the two-sided p-value compare with the one obtained on the untransformed data? (d) Find an estimate of and 95% confidence interval for the mean difference in log volumes. Back-transform these to get an estimate and confidence interval for the median of the population of ratios of volumes.

Reference no: EM131012023

Questions Cloud

Develop an arbitrage strategy using bonds : There are two zero-coupon bonds, A and B. Both bonds have a maturity of 1 year. The par value of A is $100 and the price is $90. The par value of B is $50 and the price is $44. Develop an arbitrage strategy using bonds A and B

Develop an arbitrage strategy using the spot rates : The annualized 6-month spot rate is 4% and the annualized 12-month spot rate is 6%. The annualized forward rate from the end of 6th month to the end of 12th month is 10%. Develop an arbitrage strategy using the spot rates and the forward rate.

Calculate the beta portfolio : John invested the following amounts in three stocks: Security Investment Beta Stock A $915,411 0.62 Stock B $899,517 0.88 Stock C $231,454 2.28 Calculate the beta portfolio. Round the answers to two decimal places.

What is the nominal rate of interest : A new 65 inch television sells for $1,500 and can be purchased for a down payment of $500 with additional monthly payments in the amount of $45.70 paid at the end of every month for 24 months. What is the nominal rate of interest? What is the effecti..

Guinea pig lifetimes : Use the Welch t -tools to find a two-sided p-value and confidence inter- val for the effect of treatment on lifetimes of guinea pigs in Chapter 2, Exercise 11. Does the additive treatment effect seem like a sensible model for these data?

Compute what is the average height of the building : A building has a rectangular base with opposite corners at (1,5) and (3,7). The roof is the graph of f (x,y) = x cos(y) + x + 1. What is the volume of the building and what is the average height of the building?

Find the corresponding y values to complete the ordered pair : Use a sign chart to find the local maximum and local minimum. Find the corresponding y values to complete the ordered pair for the local minimum and local maximum.

Motivation and creativity : Use a statistical computer package to compute the randomization test's two-sided p-value for testing whether the treatment effect is zero for the data in Section 1.1.1 (file case0101). How does this compare to the results from the two-sample t -te..

Trauma and metabolic expenditure : Use a statistical computer package to verify the rank-sum and the Z-statistic obtained in Exercise 20. Is the p-value the same? (Does the statistical package use a continuity correction?)

User Account

All Pages