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Computing the probability values using normal distribution.
Laboratory rats commit an average of µ = 40 errors before they solve a standardized maze problem. The distribution of error scores is approximately normal with a standard deviation of σ = 8. A research is testing the effect of a new dietary supplement on intelligence. A newborn rat is selected and is given the supplement daily until it reaches maturity. The rat is then tested on the maze and finishes with a total of X = 24 errors.
1. What is the probability that a regular rat (without the supplement) would solve the maze with a score less than or equal to X = 24 errors? 2. Is it reasonable to conclude that the rat with the supplement is smarter than the vast majority of regular rats? 3. Does it appear that the supplement has an effect on intelligence? Explain your answer.
Last week Sarah had exams in Math and in Spanish. On the Math exam, the mean was u, = 30 with a = 5, and Sarah had a score of X - 45. On the Spanish exam, the mean was u, = 60 with 0 = 6 and Sarah had a score of X = 65. For which class must Sarah ..
In a mobile phone shop on a Sunday morning, out of n = 77 customers x = 19 buy a mobile phone. What is the 95% confidence interval for the proportion of customers buying a mobile phone?
Identify the independent and dependent variables, and Construct a nominal, ordinal, and interval level measure for each independent and dependent variable.
To determine whether there is a difference in the proportion of viewers watching the three channels.
Decide whether experiment is binomial, Poisson or neither based on info given. Each week man plays game in which he has a 21% chance of winning.
Hypothesis test for the difference between two means - Assume the population standard deviations are not the same. At the 0.05 significance level, is there a difference in the mean waiting time?
Complete the test at the 5% level of significance.
What is the probability of the person is 20 to 24 years old.What is the probability of the person is 20 to 34 years old.
Create a scatter plot for the data. Determine the correlation coefficient for the data.
Why do we have so many several measures of central tendency? Are all really essential or do they essentially give same information?
Estimating confidence interval for mean value of y and find a 95% confidence interval for the expected average total sleep time for a child of age 12
Use either Linear Programming module or Transportation module of Cd to minimize the shipping costs involved in move.
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