A company compared the variance of salaries for employees who have been employed for 5 years or less with employees who have been employed for 10
years or more. They randomly selected 21 employees with 5 years or less
experience and 15 employees with 10 years or more experience. The standard
deviation for the group with 5 years or less experience was $2,225, the
standard deviation for the group with 10 years or more experience was
$1.875. Using the 0.05 significance level, what is the critical value for the
hypothesis test?

in 2001, dell computer became the world’s largest personal computer vendor, continuing to

gain market share and post profits in an industry struggling with slumping sales and billions of

dollars in losses. dell sells 90% of its pcs directly to the final customer, largely bypassing the

reseller channel that accounts for most of the world’s pc sales. this direct customer relationship

is the key to dell’s business model, and provides distinct advantages over the indirect sales

model. dell’s direct relationship with the customer allows it to tailor its offerings to customer

needs, offer add-on products and services, and use the internet to offer a variety of customer

services. in addition, dell’s pcs are built to customers’ specifications upon receipt of an order,

giving dell additional advantages over indirect pc vendors who must try to forecast demand and

ship products based on those forecasts. dell’s direct sales and build-to-order model has achieved

superior performance in the pc industry in terms of inventory turnover, reduced overhead, cash

conversion, and return on investment (kraemer, et al., 2000).

explanation:

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