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A doctor wants to estimate the mean HDL cholesterol of all 20 to 29 year old females. how many subjects are needed to estimate the mean HDL cholesterol within 3 points with 99% confidence assuming s = 19.8 based on earlier studies? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required?
If we assume a normal distribution of Diastolic blood pressures, then between what two values can we be assured 99.7% of all Diastolic blood pressures will lie?
What is the probability that next week's show will: Have between 30 and 37 million viewers? (Round z-score computation to 2 decimal places and your final answer to 4 decimal
Find the probability that a randomly selected trading value exceeds 4.1 million and find the trading volume greater than 90% of all trading volumes. Use formula X1 = Z σ + µ
Is this statistically significant evidence that the true mean diameter is greater than 20 millimeters? Set up the hypothesis, and enter your P-value below, rounded to four d
An entrepreneur in a developing country owns 10 food carts. He has ten employees to work with these food carts. Let Xi be a random variable representing revenue from cart i
Suppose you know that the slope of a regression line is b1 = +3.5. Based on this value, explain what you know and do not know about the strength and direction of the relatio
Estimate is too low for households in British Columbia. Can the value 0.64 be rejected if a survey of 490 homes in BC yields 331 with one or more lawn mowers?
A trans-oceanic airline conducted a study to determine whether the average weight of baggage checked by a passenger differs significantly from 45 pounds.
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