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soyymiilk
25.03.2021 •
Mathematics
The expression mv gives the kinetic energy, in joules, of an object with a mass of m kilograms traveling at a speed of v meters per second What is the kinetit energy of an experimental unmanned jet with a mass of 11x 100 kg traveling at a speed of about 3.4 x 10 m/s? The aircraft has a kinetic energy about joules.
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Ответ:
Step-by-step explanation:
Hello!
The FMA Company designed a new type of bowling ball and want to test if the new bowling average differs from the bowling average of the old model. Symbolically μ≠155
Sample:
n= 120 men bowling in scratch leagues
sample mean x[bar]= 170
variance δ²= 100
The hypothesis is:
H₀:μ=155
H₁:μ≠155
α: 0.05
The statistic to use for this hypothesis, assuming that the variable has a normal distribution.
Z= x[bar]-μ ≈ N(0;1)
δ/√n
The critical region for this test is two-tailed, this means you'll reject the null hypothesis to small or big values of the statistic.
You'll reject the null hypothesis to values of Z≤-1.96 or Z≥1.96.
Under the null Hypothesis the statistic value is:
Z= x[bar]-μ
δ/√n
Z= 170-155
10/√120
Z= 15/0.913 = 16.42
Decision: Reject the null Hypothesis.
I hope you have a SUPER day!