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Plate 9: The Marketing students conducted a survey to compare the length of time it took a male and a female student who belong to the same year level to review their lessons before taking the quarterly assessment in Statistics and Probability. The results of the survey were as follows:
Male
n₁=60
x₁ =5.75 hours
s₁ =1.5 hours
Female
n₂=60
x₂=7.25 hours
s₂=0.75hours
Test the claim, x₁ = x₂, at 0.05 level of significance
Find the margin of error if the confidence (significant) level is 95%.
1. n = 100, x = 80, s= 2.5
2. n=250, x = 100, s= 3.25
3. n= 300, x = 250, s = 4.15
The Y intercept formula entails the calculation of the mean for both X and Y. Is this
statement true or false?
1. True.
2. False
What is the percentage of common variance between variables if the correlation
coefficient is -0,7?
1. 70%
2. 4,9%
3. -49%
4. 49%
In a Math test, the mean score is 42 and the standard deviation is 3. Assuming normality, what is the probability that the score picked will lie above score 50? *
A potential importer intends to take a sample of 4 mangoes and will not place an order if the sample mean is less than 1.5 kilos. What is the probability that the importer will not place an order?
A pulley with a radius of 14 inches uses bolt to drive a pulley with radius 28 inches. The 14 inches pulleys turned through the angle of 150° .What angle will the 28 inches pulley turns
A potential importer intends to take a sample of 4 mangoes and will not place an order if the sample mean is less than 1.5 kilos. What is the probability that the importer will not place an order?
Find the area under the normal curve for each z-score. Shade accordingly.
1. P( < 2.20)
2. P( -2.5 < z < 2.01)
A continuous random variable is normally distributed with a mean of 45 and standard deviation 0f 6. Illustrate the following notations in a normal curve.
P( 30 < X < 50 )
P( 33 ≤ X ≤ 39)
P( X < 57 )
#339914 on Dec 2023