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given a population of 2000 normally distributed stores with mean equal to 74, and a standard deviation of 6. How many scores are between 50 and 70?
The mean gasoline computation of 10 cars is 28 liters with a standard deviation of 1.60 liters. Find the point and the interval estimate using 95% confidence level, what is the confidence level
The weight of 1000 children average 50 kg and the standard deviation is 5kg. What is the Area under the normal curve that corresponds to the z-score of 55
kg?
If 𝑃(𝑍 < 2) = 0.9772, what is 𝑃(𝑍 ≤ 2)?
2. The mean height of Grade 11 students at a certain senior high school is 164 cm. and the standard deviation is 10 cm. Assuming that the heights are normally distributed, what percent of the height is
a. greater the 168 cm?
b. less than 150 cm
c. between 150 and 168
Four rowers weighing 152, 156, 160, and 164 pounds make up a rowing team. Calculate the sample mean for each of the possible random samples with a size two replacement. They can be used to calculate the sample mean's probability distribution, mean, and standard deviation.
A concerned citizen group claims that 50% of the people in the city A support making beers illegal. Yoi decide to test this claim and ask a random sample of 315 out of 6000 people in the concerned city whether they support making beers illegal, 49% support this law. At 0.05 significance level, is there enough evidence to support this claim?
What is the shape of the sampling distribution of the means if random of size n becomes larger?
IQ scores for adults are normally distributed with mean of 100 and standard deviation of 15. What percent of adults have IQ scores greater than 130?
With α=.10
α=.10, what are the critical values?
