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Q1) Researcher would to study the effects of humidity on eating behaviour. It is known that laboratory rats normally eat average of m = 21 grams of food each day. Researcher chooses random sample of n = 16 rats and places in controlled atmosphere room in which relative humidity is maintained at 90%. Daily food consumption scores for rats are as follows:
14, 18, 21, 15, 18, 18, 21, 18, 16, 20, 17, 19, 20, 17, 17, 19
a) Can researcher conclude that humidity has significant effect on eating behaviour? Use two-tailed test with a = 0.05
Scores on a test have a mean of 73 and Q3 is 81. The scores have a distribution that is approximately normal. Find P90.
Suppose the population is normally distributed they make a decision to do a hypothesis test.
What is the probability of obtaining 4 ones in a row when rolling a fair, six-sided die? Interpret this probability.
The dealership would now like some general information based on the entire sample of vehicles. Calculate and explain the following:
When the level of confidence and sample size remain the same, a confidence interval for a population proportion π will be __________ when p(1-p) is larger than when p(1-p) is smaller.
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36 values given here are based on summary statistics from research by cumming. Do you think that these data are normally distributed?
The lifetime of a 2-volt non-rechargeable battery in constant use has a Normal distribution with a mean of 516 hours and a standard deviation of 20 hours. The proportion of batteries with lifetimes exceeding 520 hours is approximately.
Determine percent of the garages take between 29 hours and 34 hours to erect? Determine percent of garages take 28.7 hours or less to erect?
What is the 90% confidence interval estimate of the difference between two population means.
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