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Q1) A kindergarten class comprises of 14 boys and 11 girls. If teacher chooses children from class using random sampling.
a) Determine the probability that first child selected will be a girl?
b) If teacher chooses random sample of n=3 children and first two children are both boys. Determine the probability that third child selected will be a girl?
Q2) What is sampling with replacement, and why it is used?
Q3) For normal distribution, recognize z-score location that would separate distribution into two sections so the there is
a) 70% in the body on the right-hand side.
b) 80% in the body on the right-hand side.
c) 75% in the body on the left-hand side.
d) 90% in the body on the left-hand side.
Give a mathematical expression for the probability density function of driving distance.
What is your conclusion? Are the two variables independent?
Each vehicle had the gallon of gas added to the empty tank and then driven until empty. Number of miles travelled for all twelve readings are below. Use data to compute the mean and median mileages.
The hypothesis is to be tested at the 5% level of significance. The critical value from the table equals:
Which of the following assumptions for inference about a proportion using a confidence interval are violated,
Is the sample size large enough to construct a valid confidence interval for the proportion of debit cardholders who have used their card in making purchases over the Internet?
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 ..
We want to estimate the population mean within 5, with a 99% confidence level. The population std dev is estimated to be 15. How large is the required sample size?
As sample size increases, the standard error of M _______________ .
Create probability tree showing all marginal, conditional, and joint probabilities. Create a joint probability table.
Test for significant differences among weight losses for the five diets, and perform all pair wise comparisons using:
The management of White companies considering a new method of assembling its golf cart. Compute which assembly time using the new method is faster.
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