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A telescope manufacturer wants its telescopes to have standard deviations in resolution to be significantly below 2 when focusing on objects 500 light-years away. When a telescope is used to focus on an object 500 light years away 30 times, the sample standard deviation turns out to be 1.46.
a.State explicit null and alternate hypotheses
b.Test your hypothesis at the á=0.01 level.
To investigate the fluid mechanics of swimming, twenty swimmers each swam a specified distance in a water-filled pool and in a pool where the water was thickened with food grade guar gum to create a syrup-like consistency. Velocity, in meters per sec..
Find the P value for the indicated hypothesis test with the given standardized test statistic, z. Decide whether to reject H0 for the given level of significance deviation. Two-tailed test with test statistic z= -2.43 and standard deviation = 0.04..
If you are performing a hypothesis test using a z statistic in which you sampled 50 people and found an average SAT verbal score of 542 (assume we know the population mean to be 500 and the standard deviation to be 100)
A die is loaded in such a way that the probability of each face turning up is proportional to the number of dots on that face. What is the probability of getting an even number in one throw?
You want to test the hypothesis that the mean age for teachers is equal to 50. If you take a sample of 64 observations and find a sample mean of 49
The speeds of all vehicles have a bell-shaped distribution with a mean of 72 mph and a standard deviation of 3 mph. Using the empirical rule, find the percentage of vehicles with the following speeds on this section of I-95.
Suppose the inspector is unhappy with the previous result and would like to resample. How many rolls should be sampled to estimate the mean tensile strength within 1.5 PSI with 95% confidence?
These plot yields followed approximately a normal distribution with mean 88 lb and SD 7 lb. Find the probability that any one randomly selected plot yield is greater than 90 lb.
Ten different people's income tax returns are done by each of the three software packages and the time is recorded for each. Which of the following is true?
Choose the most reasonable measurement. Tyrell read the nutrition label on the back of his frozen dinner. Choose the most reasonable estimate for the amount of sodium in the dinner.
The old equipment? based on the results, does the new equipment appears to be effective in reducing the variation of the weights?
The director for training at a company that manufactures electronic equipment is interested in determining whether different training methods have an effect on the productivity of assembly line employees.
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