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Average sales for an online textbook distributor were $74.67 per customer per purchase. Assume the sales are normally distributed. If the standard deviation of the amount spent on a textbooks is $9.49, find these probabilities for a randomly selected customer of the online textbook distributor
The probability that a randomly select customer spent more than 93.65 per purchase is what percent?
1. Plot the data. Does there seem to be a linear relationship between the discount offered and sales on "Big Saturday" events? Yes or No 2. Calculate a regression line for this data (use whole numbers for the percent discount, that is, use 15 f..
1.a study was conducted to explore the relation between alcohol consumption and hypertension. 7400 nurses were surveyed
identify the indicated type of errora carter motor company claims that its new sedan the libra will average better than
Smith bicycled 45 miles going east from Durango, and Jones bicycled 70 miles. Jones averaged 5 miles per hour more than Smith, and his trip took one-half hour longer than Smith's. How fast was each one traveling?
A random sample of teachers from Georgia and an independent random sample of teachers from Indiana have been asked to report their mean annual income.
Perform an exponential smoothing forecast with α=0.3 with the following data. Use the demand for the month of January for the initial forecast.
Using numerical and graphical summaries, describe the distribution of each explanatory variable. Are there any unusual observations that should be monitored?
A recent study indicated that 29% of the 100 women over age 55 in the study were widows. If no estimate of the sample proportion is available how large should the sample be?
A certain type of tomato seed germinates 90% of the time. A backyard farmer planted 25 seeds. What is the probability that exactly 20 germinate?
Given the data set body-weight.sav, use SPSS to calculate the 90%, 95% and 99% confidence intervals for the mean of the variable weight.
Find the probability that the mean GPA of a random sample of 20 students selected from this university is 2.95 or lower.
In biostatistics, hypothesis testing is used to determine the likelihood of observing a particular value of a sample statistic. Confidence intervals provide a measure of accuracy by allowing us to define a range within which the true population param..
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