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SmithCo is a supplier to many brand-name makers of mobile phones. SmithCo manufactures the external shells that enclose mobile phones. The strength of a shell is measured by applying increasing pressure to the shell and recording the pressure at which the shell breaks. Shell strengths are approximately normally distributed. A random sample of 10 shells made by SmithCo showed an average strength of 45.0 pounds and a standard deviation of 2.0 pounds. Use StatTools, or conduct calculations by hand, to construct a 90% confidence interval for the mean shell strength. The appropriate multiplier is 1.833.
a. State the confidence interval in the form a ± b.
b. State the confidence interval in the form [c, d].
the student body of a large university consists of 30 business majors. a random sample of 20 students is selected.a.
What is an example of a directional alternate hypothesis? What is an example of a non-directional alternate hypothesis?
What is the Chi-square test? Where can you apply it? Please site an example of how it was used and the outcome of the test. I think this could help me better than the book, it is difficult to understand.
nielsen media research provides two measures of the television viewing audience a television program rating which is
Complete the procedure on each of 36 occasions. Assuming we wich to be 99% certain of avoiding a Type I error, use these data to evaluate the union's claim.
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?
She will make the mean raise $1000 and the standard deviation $179. Basing this on worker productivity (toys constructed), the most productive 10% of employees will see a raise of at least how much?
Confidence intervals for the population mean number of that color of M&Ms in a pack. You may assume that the M&M are approximately normally distributed. Which form of the formula did you use and why?
The General Social Survey is an annual survey given to about 1500 U.S. adults selected at random. Each year, the survey contains several questions meant to probe respondents' views of employment.
The weight of a .5 cubic yard bag of landscape mulch in uniformly distributed over the interval from 38.5 to 41.5 pounds. Give a mathematical expression for the probability density function.
1. using the data collected from the student data survey at the beginning of the course construct a
the life spans of car batteries are normally distributed with a mean of 44 months and a standard diviation of 5
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