731 If the null hypothesis is true as an equality, the sampling distribution of x is approximated by and a standard deviation of distribution with The value of the standardized test statistic is Use the Distributions tool to help you answer the questions that follow. "/>
Extracted text: 5. Testing the population mean when the population standard deviation is known Lenders tighten or loosen their standards for issuing credit as economic conditions.change. One of the criteria Tenders use to evaluate the creditworthinesS of a potential borroWer.js her credit risk Score, usually.a FICO Score. FICO Scores range from 300 to 850. A consumer with a high| Score is perceived to be a low credīt risk to the lėňdeř ăňd is more likelý to be extended' cređiť than à consumér with a low score. A credit, card represents, a line of credit,,bęcause the credit card holder obtains a loan whenever the card mean FICO score for the credit card holder at the time the card was issued) of deviation of 76. TSource: Sumit Agārwal John C. DriscoLXayier Gabaix, and David Laibson Learning in the Credit Card Märket," "Wörking' Paper 13822, National Buřeau of Economič Research (NBER), Fébrüary 2008.] used to paY for a purchase. A study of creditcard accounts opened in 2002 found a [731 and a standard You conduct a hypothesis test to determine whether bạnks have Josened their standards for ISsuing credit cards since 2002. You collect a rangom sample of 64 credit cards ISsued during the past 6 montis. The sample mean FICO Score of the credit cărd holders (at the time their cards were issued) is x = 717. Assume that the standard deviation of the population of FICO scores for gredit cards issued during the past 6 months is known to be o = the NBER Study. 76, the standard deviation from Let H equal the true population mean, FICO score for.consumers issued credit cards in the past 6 months. You should formulate the nüll' ând ălterňative hypotheses as: O Ho: x = 731, H1: x < 731="" ho:="" μ="" -731,="" η="" 1:="" μ="">< 731="" ho:="" µ="">< 731,="" h1:="" µ="731" ho:="" µ="731," h1:="" µ=""> 731 If the null hypothesis is true as an equality, the sampling distribution of x is approximated by and a standard deviation of distribution with The value of the standardized test statistic is Use the Distributions tool to help you answer the questions that follow.
Extracted text: Use the Distributions tool to help you answer the questions that follow. Normal Distribution Mean = 730 Standard Deviation = 8.5 710 720 730 740 75(8 -2 -1 1 2 You conduct the hypothesis test using a şignificance leVEL SDproach, when do you reject the ňll of Use the tool to develop the. rejection region for"yoür test. According to the critical value hypothesis? O Reject H1 if z < -1.282="" o="" reject="" ho="" if="" z="">< -1.645="" or="" z="" 2="" 1.645="" o="" reject="" h,="" if="" z="">< -1.282 o reject h, if z 2 -1.47 the p-value is using the critical value approach, the null hypothesis is because using the p-value approach, the null hypothesis is because their standards for issutng credit cards since 2002. therefore, you conclude that banks have loosened -1.282="" o="" reject="" h,="" if="" z="" 2="" -1.47="" the="" p-value="" is="" using="" the="" critical="" value="" approach,="" the="" null="" hypothesis="" is="" because="" using="" the="" p-value="" approach,="" the="" null="" hypothesis="" is="" because="" their="" standards="" for="" issutng="" credit="" cards="" since="" 2002.="" therefore,="" you="" conclude="" that="" banks="" have="">