In Research on Cell Phone Use by Teenagers It Was

question 87

Multiple Choice

In research on cell phone use by teenagers it was found that the average time for a call was at least 15 minutes. Social psychologists feel that this study understated the time. To determine this claim, cell phone bills for 15 teenagers were evaluated. On average, the time spent was 18.5 minutes per call with a sample standard deviation of four minutes (assume a normal distribution) .
-The null and alternative hypotheses to test whether the original research claim is valid is _____.

• A)H₀: ? = 15 vs.H_a: ? ? 15
• B)H₀: ? ? 15 vs.H_a: ? < 15
• C)H₀: ? ? 18.5 vs.H_a: ? < 18.5
• D)H₀: ? ? 15 vs.H_a: ? = 15
• E)H₀: ? ? 15 vs.H_a: ? > 15

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Definitions:

Data Predictions

The process of using algorithms, statistics, and machine learning techniques to forecast future outcomes based on historical data.

Bit

The smallest unit of data in computing, representing a binary value of either 0 or 1.

Byte

The basic unit of data storage in computing and digital communications that most commonly consists of eight bits.

Field

A characteristic of interest that describes an entity.