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In a recent year, scores on a standardized test for high school student with a 3.50 to 4.00 grade point average were normally distributed, with a mean of 39.4 and a standard deviation of 2.3.A student with a 3.5 to 4.00 grade point average who took the test standardized test is randomly selected.
A. Find the probability that he student's test score is less than 35.
B. Find the probability that he student's test score is between 35.5 and 43.3.
C. Find the probability that he student's test score is more than 41.4
Looking at the data, you suspect that the manufacturer is incorrect in its label claim. You want to perform hypothesis testing to prove or disprove it.
A random sample of gasoline taxes (in cents) is shown here for 12 states. Use the data to estimate the true population mean gasoline tax with 90% confidence. Does your interval contain the national average of 44.7 cents?
How long would it take to estimate the % of entries having errors using a random sample big enough to get a margin of error less than 2%?
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the number of calories and number of grams of sugar per serving were measured for 36 breakfast cereals. the data are in
Of those customers using extra unleaded or premium gas, 60% fill their tanks. What is the probability that the next customer fills the tank?
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if p .05 the critical value for rejecting the null hypothesis
Find the 90% confidence interval for the mean, variance, and standard deviation for the price in dollars of an adult single-day ski lift ticket.
In a sample of 20 men, the mean height was 178 cm. In a sample of 30 women, the mean height was 164 cm. What was the mean height for both groups put together?
The machine will stop working if more than three components fail. Find the probability that the machine will be working.
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