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To compute the 90% confidence interval for the mean
Latasha is a waitress at Seventh Heaven Hamburgers. She wants to estimate the average amount each group at a table leaves for a tip. A random sample of 52 groups gave a mean of $8.30 with a standard deviation of $2.42.
Find a 90% confidence interval for the mean amount left by all groups.
The p-value for a test statistic is .085, what is the minimum level of significance required to reject the null hypothesis?
They find that these 100 people lost an average of 38 hours with a standard deviation of 9.5 hours. What is the P-value for this significance test?
Environmental Protection Agency (EPA) fuel economy estimates for automobile models tested recently predicted a mean of 24.80 mpg and a standard deviation of 6.2mpg for highway driving. Assume that a normal model can be applied.
The probability that a bomber hits a target on a bombing mission is 0.700. Three bombers are sent to bomb a particular target.
The function that defines the probability distribution of a continuous random variable is a?For a continuous random variable x, the probability density function f(x) represents.
At the .10 level of significance, is the coin biased toward heads? Show your decision rule and calculations.
Find a 90% confidence interval for the mean decibel level µ for this type of transit vehicle.
Salary information for a random sample of male and female employees of a large company is shown below.
To conclude the effect of a new fertilizer on productivity of tomato plants one group of plants is treated with the new fertilizer as a second group is grown without such treatment. The number of ripe tomatoes produced by each group is counted.
The manager is concerned that sales are slipping, after taking into account the average value of sales for four consecutive Saturdays being $4800.
We wish to create this mean value interval for selling price with 95% confidence level. Find out the best point estimate (average) for selling price. Critical t-value(s) associated with 95% confidence level.
What is the appropriate set of hypotheses to test such that a possible outcome of the test would indicate;
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