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We wish to estimate the average number of heartbeats per minute for a certain population. The average number of heartbeats per minute for a sample of 49 subjects was found to be 90. Assume that these 49 patients constitute a random sample, and that the population is normally distributed with a standard deviation of 10. Find a 90% confidence interval for the population mean, what is the lower bound? Round the final answer to 2 decimal places.
Write the null and alternative hypotheses you would use to test each of the following situations.- In the 1950s only about 40% of high school graduates went on to college. Has the percentage changed?
What is the probability that a randomly selected value from the distribution will be less than 46.5?
Choose an American driver at random and let the random variable X be the number of speeding tickets the driver has received in the last two years. The discrete probability distribution of X is shown.
Expected Commercial Value Forcast
Construct a? 99% confidence interval for the population proportion. Interpret the results.
the marketing research team of an investment corporation is trying to determine its target market for the promotion of
the estimate of the population proportions is to be within plus or minus .10 with a 95 percent level of confidence. the
senior management of a consulting services firm is concerned about a growing decline in the firms weekly number of
In the relationship between height and mid-parent height, which variable is the response variable (y) and which is the explanatory variable (x)?
Keith's florist has 18 delivery trucks used mainly to deliver flowers in the SC area. Of these 18 trucks, 5 have brake problems. A sample of 4 trucks is randomly selected. What is the probability that 2 of those defective have defective braked. Ro..
Assuming sales are normally distributed, what is the probability that total sales for a 7 day period are $,7,700.00 or more.
Calculate the correlation, and find and report the equation of the regression line, using height as the predictor and weight as the response.
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