5. When both sample sizes are 15, both population standard deviation are 10, and the sample averages are 32 and 35 respectively the experimental Z is 0.822.
True
False
Formula for experimental Z is :
Putting all the values in the formula we get :
Hence, the above statement is TRUE.
5. When both sample sizes are 15, both population standard deviation are 10, and the sample...
QUESTION 1 1. The sample variance or the sample standard deviation are good approximate of the population variance or standard deviation? True or False QUESTION 2 1. The Central limit theorem states that the individual results or when n is 1 in an experiment that unique outcome follow a Normal Distribution? True or False QUESTION 3 1. In hypothesis testing alpha is the probability of being judged correct? True or False QUESTION 4 1. If the critical Z is ±...
problems 4, 5, 6, 11 and 13 If the population standard deviation was doubled to 10.4 and the level of confidence remained at 90%, what would be the new margin of error and confidence interval Margin of error, E. Confidence interval: 20.11<x<34.31 O Did the confidence interval increase or decrease and why? increase 4. Definition of Confidence Intervals (Section 6.1) Circle your answer, True of False. • A 99% confidence interval means that there is a 99% probability that the...
Question 2 You may use the Normal distribution when you have the standard deviation of the sample and the sample size is higher than 30. True False Question 3 With of 98 and a sample standard deviation of 10, the sample size of 16, and the population mean (μ) of a 100, the experimental t value is 0.8, and the P – value is between 0.10 and 0.25. True False
A random sample is selected from a population with mean μ = 102 and standard deviation σ = 10. Determine the mean and standard deviation of the xbar sampling distribution for each of the following sample sizes. (Round the answers to three decimal places.) (a) n = 15 μ = σ = (b) n = 35 μ = σ = (c) n = 55 μ = σ = (d) n = 110 μ = σ = (e) n = 440...
The sample variance or the sample standard deviation are good approximate of the population variance or standard deviation? True False
As sample sizes _____________________, the standard deviation of the sampling distribution decreases indicating that the sample means cluster more tightly around the population mean. increases change stay the same decreases
3) The average population height for 15 year-old girls is 63.80 inches with a standard deviation of 2.66 inches. Denise, a 15-year-old girl, is in the 30th percentile for height, how tall is she? (Hint: You will need to convert your z-score to a raw score, see 5/7 lecture slides) 4) You rando the student population of this school is 127 with a standard deviation of 8. mly sample a class of 32 students with a mean IQ of 134...
The standard deviation of the population is commonly used to estimate the standard deviation of the sample. True False
The population mean is $51,300 and the population standard deviation is $5,000. When the sample size is n=20 , there is a .3472 probability of obtaining a sample mean within +/- $500 of the population mean. Use z-table. a. What is the probability that the sample mean is within $500 of the population mean if a sample of size 40 is used (to 4 decimals)? b. What is the probability that the sample mean is within $500 of the population...
11 a) True or False: The t distribution has a greater standard deviation than the standard normal z distribution. Can you explain or prove why this is True? I have a hunch it has something to do with the sample sizes vs the population but I'm really not sure & I really like to be able to explain why things are true or false for questions like this. Thanks!